It is the naval architect who

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Magnitude of the principal stresses controls (or governs) the degree of birefringence.

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Covalent bonds are responsible for atomic combinations in many elements.

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θ is the angle defining the position of the rotor with respect to the stator.

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These elements define the geometry of the orbit.

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The take-off condition dictates (or determines, or defines) the amount of wing area required for an airplane.

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The armature of the rudder motor dictates the direction in which the rudder motor rotates.

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The rate at which a furnace can melt scrap governs the rate at which it can accommodate successive portions of the charge.

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These equations govern simple waves.

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It is the naval architect who settles (or decides on) the form of the vessel.

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Three points determine a circle.

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The geometry of the small ring compounds fixes their configuration.

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The equation specifies the topography of the potential surface.

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These variables are difficult to appraise accurately.

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The cost of steam generation required by the power plant can be arrived at (or defined) from Fig. 2.

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A number of coils were rolled to assess the performance of the controller.

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The pressure was determined (or deduced) from the weight of steam and...

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Reserves are estimated (or evaluated) at 100,000,000 bbl.

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To assess the distribution and level of the pollutant...

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This knowledge enables the analyst to gauge the meaning and reliability of the results obtained.

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Information about temperatures below the surface can be inferred from the magnetic properties of rocks.

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The adequacy of the global supply can be gauged through a simple analysis of the per capita need for water.

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If the wavelength composition of the light is known, its colour can be specified (or determined, or identified).

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Identify the two chemicals in the equation for which...

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The closer you want to pinpoint the exact orbit, the more corrections you must make.

SUBJECT AREA: Ports and shipping

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Yourkevitch came from an academic family, but one without any experience or tradition of sea service. Despite this he decided to become a naval architect, and after secondary education at Moscow and engineering training at the St Petersburg Polytechnic, he graduated in 1909. For the following ten years he worked designing battleships and later submarines, mostly at the Baltic Shipyard in St Petersburg. Around 1910 he became a full member of the Russian Naval Constructors Corps, and in 1915 he was a founder member and first Scientific Secretary of the Society of Naval Engineers.

Using the published data of the American Admiral D.W. Taylor and taking advantage of access to the Norddeutscher Lloyd Testing Tank at Bremerhaven, Yourkevitch proposed a new hull form with bulbous bow and long entrances and runs. This was the basis for the revolutionary battleships then laid down at St Petersburg, the "Borodino" class. Owing to the war these ships were launched but never completed. At the conclusion of the war Yourkevitch found himself in Constantinople, where he experienced the life of a refugee, and then he moved to Paris where he accepted almost any work on offer. Fortunately in 1928, through an introduction, he was appointed a draughtsman at the St Nazaire shipyard. Despite his relatively lowly position, he used all his personality to persuade the French company to alter the hull form of the future record breaker Normandie. The gamble paid off and Yourkevitch was able to set up his own naval architecture company, BECNY, which designed many well-known liners, including the French Pasteur.

In 1939 he settled in North America, becoming a US citizen in 1945. On the night of the fire on the Normandie, he was in New York but was prevented from going close to the ship by the police, and the possibility of saving the ship was thrown away. He was involved in many projects as well as lecturing at Ann Arbor, Michigan, and at the Massachusetts Institute of Technology. He maintained connections with his technical colleagues in St Petersburg in the later years of his life. His unfulfilled dream was the creation of a superliner to carry 5,000 passengers and thus able to make dramatic cuts in the cost of transatlantic travel. Yourkevitch was a fine example of a man whose vision enabled him to serve science and engineering without consideration of inter-national boundaries.

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SUBJECT AREA: Ports and shipping

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On leaving school in 1894, MacGregor was apprenticed to a famous local shipyard, the Palmers Shipbuilding and Iron Company of Jarrow-on-Tyne. After four years he was entered for the annual examination of the Worshipful Company of Shipwrights, coming out top and being nominated Queen's Prizeman. Shortly thereafter he moved around shipyards to gain experience, working in Glasgow, Hull, Newcastle and then Dunkirk. His mastery of French enabled him to obtain in 1906 the senior position of Chief Draughtsman at an Antwerp shipyard, where he remained until 1914. On his return to Britain, he took charge of the small yard of Dibbles in Southampton and commenced a period of great personal development and productivity. His fertile mind enabled him to register no fewer than ten patents in the years 1919 to 1923.

In 1924 he started out on his own as a naval architect, specializing in the coal trade of the North Sea. At that time, colliers had wooden hatch covers, which despite every caution could be smashed by heavy seas, and which in time of war added little to hull integrity after a torpedo strike. The International Loadline Committee of 1932 noted that 13 per cent of ship losses were through hatch failures. In 1927, designs for selftrimming colliers were developed, as well as designs for steel hatch covers. In 1928 the first patents were under way and the business was known for some years as MacGregor and King. During this period, steel hatch covers were fitted to 105 ships.

In 1937 MacGregor invited his brother Joseph (c. 1883–1967) to join him. Joseph had wide experience in ship repairs and had worked for many years as General Manager of the Prince of Wales Dry Docks in Swansea, a port noted for its coal exports. By 1939 they were operating from Whitley Bay with the name that was to become world famous: MacGregor and Company (Naval Architects) Ltd. The new company worked in association with the shipyards of Austin's of Sunderland and Burntisland of Fife, which were then developing the "flatiron" colliers for the up-river London coal trade. The MacGregor business gained a great boost when the massive coastal fleet of William Cory \& Son was fitted with steel hatches.

In 1945 the brothers appointed Henri Kummerman (b. 1908, Vienna; d. 1984, Geneva) as their sales agent in Europe. Over the years, Kummerman effected greater control on the MacGregor business and, through his astute business dealings and his well-organized sales drives worldwide, welded together an international company in hatch covers, cargo handling and associated work. Before his death, Robert MacGregor was to see mastery of the design of single-pull steel hatch covers and to witness the acceptance of MacGregor hatch covers worldwide. Most important of all, he had contributed to great increases in the safety and the quality of life at sea.

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See also: Ayre, Sir Amos Lowrey

SUBJECT AREA: Ports and shipping

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Murray was educated in Glasgow at Allan Glen's School and then at the University, from which he graduated in naval architecture in 1922. He served an apprenticeship simultaneously with Barclay Curle \& Co., rising to the rank of Assistant Shipyard Manager before leaving in 1927 to join Lloyd's Register of Shipping. After an initial year in Newcastle, he joined the head office in London, which was to be base for the remainder of his working life. Starting with plan approval, he worked his way to experimental work on ship structures and was ultimately given the massive task of revising Lloyd's Rules and placing them on a scientific basis. During the Second World War he acted as liaison officer between Lloyd's and the Admiralty. Throughout his career he presented no fewer than twenty-two papers on ship design, and of these nearly half dealt with hull longitudinal strength. This work won him considerable acclaim and several awards and was of fundamental importance to the shipping industry. The Royal Institution of Naval Architects honoured Murray in 1960 by inviting him to present one of the only two papers read at their centenary meeting: "Merchant ships 1860–1960". At Lloyd's Register he rose to Chief Ship Surveyor, and at the time of his death was Honorary Vice-President of the Royal Institution of Naval Architects.

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SUBJECT AREA: Ports and shipping

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After the death of his father, Seppings at the age of 14 moved to his uncle's home in Plymouth, where shortly after (1782) he was apprenticed to the Master Shipwright. His indentures were honoured fully by 1789 and he commenced his climb up the professional ladder of the ship construction department of the Royal Dockyards. In 1797 he became Assistant Master Shipwright at Plymouth, and in 1804 he was appointed Master Shipwright at Chatham. In 1813 Sir William Rule, Surveyor to the Navy, retired and the number of surveyors was increased to three, with Seppings being appointed the junior. Later he was to become Surveyor to the Royal Navy, a post he held until his retirement in 1832. Seppings introduced many changes to ship construction in the early part of the nineteenth century. It is likely that the introduction of these innovations required positive and confident management, and their acceptance tells us much about Seppings. The best-known changes were the round bow and stern in men-of-war and the alteration to framing systems.

The Seppings form of diagonal bracing ensured that wooden ships, which are notorious for hogging (i.e. drooping at the bow and stern), were stronger and therefore able to be built with greater length. This change was complemented by modifications to the floors, frames and futtocks (analogous to the ribs of a ship). These developments were to be taken further once iron composite construction (wooden sheathing on iron frames) was adopted in the United Kingdom mid-century.

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SUBJECT AREA: Ports and shipping

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Despite being one of the youngest entrants to the South Kensington School of Naval Architecture, Purvis obtained both a Whitworth Exhibition and a Scholarship. Upon graduating he commenced a career in shipbuilding that involved him in military, civil and research work in Scotland, England and Japan. Initially he worked in Robert Napier's shipyard on the River Clyde, and then in the London drawing offices of Sir Edward Reed, before joining the staff of the Admiralty, where he assisted William Froude in his classic ship experiments at Torquay. After a short spell with Sir William Pearce at Govan, Purvis joined William Denny and Bros and with his recently gained knowledge of hydrodynamics helped set up the world's first commercial ship model tank at Dumbarton. His penultimate appointment was that of Shipbuilding Partner in the Scottish shipyard of Blackwood and Gordon.

In 1901 he became Professor of Naval Architecture at the Imperial University of Tokyo (succeeding Percy Hillhouse, who had become Naval Architect of Fairfield and later became Professor at Glasgow University) and it was in this role that Purvis was to achieve distinction through developing a teaching course of the highest order. It is accepted that his influence on the Japanese shipbuilding industry was profound. After nineteen years of service he retired to the United Kingdom.

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SUBJECT AREA: Ports and shipping

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Waymouth had initial training in shipbuilding at one of the Royal Dockyards before going on to work at a privately owned shipyard. With this all-round experience he was accepted in 1854 by Lloyd's Register of Shipping as a surveyor, and was to serve the Society well during a period of great change in ship design. In 1864 he was charged with the task of framing the Rules for the Construction of Composite Built Vessels, i.e. ships with main structural members such as keel, frames and deck beams of iron and with the hull sheathing or planking of timber. Although long superseded, these rules were of considerable consequence at the time and they were accompanied by beautiful drawings executed by Harry J.Cornish, who became Chief Ship Surveyor of Lloyd's from 1900 until 1909. In 1870 revolutionary proposals were made for iron ships that led to the adoption of a new form of rules where the scantlings or size of individual parts were related to the overall dimensions of the vessel. The symbol 100A1 was then adopted for the first time.

Waymouth was more than a theoretical naval architect: in the late 1860s he was commissioned by the shipbuilders Walter Hood to design the famous Aberdeen Clipper Thermopylae. This was one of the fastest sailing ships of the nineteenth century and, along with its Clyde-built counterpart Cutty Sark, proved the efficacy of composite construction for these specialist vessels.

Waymouth was appointed Principal Surveyor of Lloyd's in 1870 and was Secretary of the Society from 1872 until his death at work in 1890. He was a member of the Royal Commission on Tonnage and of the Enquiry into the loss of HMS Atlanta, and at the time of his death was Vice-President of the Institution of Naval Architects.

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SUBJECT AREA: Ports and shipping

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He was the son of Jeremiah Bentham, a lawyer. His mother died when he was an infant and his early education was at Westminster. At the age of 14 he was apprenticed to a master shipwright at Woolwich and later at Chatham Dockyard, where he made some small improvements in the fittings of ships. In 1778 he completed his apprenticeship and sailed on the Bienfaisant on a summer cruise of the Channel Fleet where he suggested and supervised several improvements to the steering gear and gun fittings.

Unable to find suitable employment at home, he sailed for Russia to study naval architecture and shipbuilding, arriving at St Petersburg in 1780, whence he travelled throughout Russia as far as the frontier of China, examining mines and methods of working metals. He settled in Kritchev in 1782 and there established a small shipyard with a motley work-force. In 1784 he was appointed to command a battalion. He set up a yard on the "Panopticon" principle, with all workshops radiating from his own central office. He increased the armament of his ships greatly by strengthening the hulls and fitting guns without recoil, which resulted in a great victory over the Turks at Liman in 1788. For this he was awarded the Cross of St George and promoted to Brigadier- General. Soon after, he was appointed to a command in Siberia, where he was responsible for opening up the resources of the country greatly by developing river navigation.

In 1791 he returned to England, where he was at first involved in the development of the Panopticon for his brother as well as with several other patents. In 1795 he was asked to look into the mechanization of the naval dockyards, and for the next eighteen years he was involved in improving methods of naval construction and machinery. He was responsible for the invention of the steam dredger, the caisson method of enclosing the entrances to docks, and the development of non-recoil cannonades of large calibre.

His intervention in the maladministration of the naval dockyards resulted in an enquiry that brought about the clearing-away of much corruption, making him very unpopular. As a result he was sent to St Petersburg to arrange for the building of a number of ships for the British navy, in which the Russians had no intention of co-operating. On his return to England after two years he was told that his office of Inspector-General of Navy Works had been abolished and he was appointed to the Navy Board; he had several disagreements with John Rennie and in 1812 was told that this office, too, had been abolished. He went to live in France, where he stayed for thirteen years, returning in 1827 to arrange for the publication of some of his papers.

There is some doubt about his use of his title: there is no record of his having received a knighthood in England, but it was assumed that he was authorized to use the title, granted to him in Russia, after his presentation to the Tsar in 1809.

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SUBJECT AREA: Ports and shipping

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For a man who contributed much to the history of shipbuilding in Britain, surprisingly little is known of his life and times. The family are reputedly descendants of Danish or Norwegian shipbuilders who emigrated to England around the late seventeenth century. It is known, however, that Marmaduke was the fourth child of his father, Hugh Stalkartt, but the second child of Hugh's second wife.

Stalkartt is believed to have served an apprenticeship at the Naval Yard at Deptford on the Thames. He had advanced sufficiently by 1796 for the Admiralty to send him to India to establish shipyards dedicated to the construction of men-of-war in teak. The worsening supply of oak from England, and to a lesser extent Scotland, coupled with the war with France was making ship procurement one of the great concerns of the time. The ready supply of hardwoods from the subcontinent was a serious attempt to overcome this problem. For some years one of the shipyards in Calcutta was known as Stalkartt's Yard and this gives some credence to the belief that Stalkartt left the Navy while overseas and started his own shipbuilding organization.

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SUBJECT AREA: Ports and shipping

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From 1844 until 1962, the Clyde shipyard of William Denny and Brothers, Dumbarton, produced over 1,500 ships, trained innumerable students of all nationalities in shipbuilding and marine engineering, and for the seventy-plus years of their existence were accepted worldwide as the leaders in the application of science to ship design and construction. Until the closure of the yard members of the Denny family were among the partners and later directors of the firm: they included men as distinguished as Dr Peter Denny (1821(?)–95), Sir Archibald Denny (1860–1936) and Sir Maurice Denny (1886– 1955), the main collaborator in the design of the Denny-Brown ship stabilizer.

One of the most influential of this shipbuilding family was William Denny, now referred to as William 3! His early education was at Dumbarton, then on Jersey and finally at the Royal High School, Edinburgh, before he commenced an apprenticeship at his father's shipyard. From the outset he not only showed great aptitude for learning and hard work but also displayed an ability to create good relationships with all he came into contact with. At the early age of 21 he was admitted a partner of the shipbuilding business of William Denny and Brothers, and some years later also of the associated engineering firm of Denny \& Co. His deep-felt interest in what is now known as industrial relations led him in 1871 to set up a piecework system of payment in the shipyard. In this he was helped by the Yard Manager, Richard Ramage, who later was to found the Leith shipyard, which produced the world's most elegant steam yachts. This research was published later as a pamphlet called The Worth of Wages, an unusual and forward-looking action for the 1860s, when Denny maintained that an absentee employer should earn as much contempt and disapproval as an absentee landlord! In 1880 he initiated an awards scheme for all company employees, with grants and awards for inventions and production improvements. William Denny was not slow to impose new methods and to research naval architecture, a special interest being progressive ship trials with a view to predicting effective horsepower. In time this led to his proposal to the partners to build a ship model testing tank beside the Dumbarton shipyard; this scheme was completed in 1883 and was to the third in the world (after the Admiralty tank at Torquay, managed by William Froude and the Royal Netherlands Navy facility at Amsterdam, under B.J. Tideman. In 1876 the Denny Shipyard started work with mild-quality shipbuilding steel on hulls for the Irrawaddy Flotilla Company, and in 1879 the world's first two ships of any size using this weight-saving material were produced: they were the Rotomahana for the Union Steamship Company of New Zealand and the Buenos Ayrean for the Allan Line of Glasgow. On the naval-architecture side he was involved in Denny's proposals for standard cross curves of stability for all ships, which had far-reaching effects and are now accepted worldwide. He served on the committee working on improvements to the Load Line regulations and many other similar public bodies. After a severe bout of typhoid and an almost unacceptable burden of work, he left the United Kingdom for South America in June 1886 to attend to business with La Platense Flotilla Company, an associate company of William Denny and Brothers. In March the following year, while in Buenos Aires, he died by his own hand, a death that caused great and genuine sadness in the West of Scotland and elsewhere.

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SUBJECT AREA: Ports and shipping

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King was educated at the High School of Glasgow, and then served an apprenticeship with the Port Glasgow shipyard of Russell \& Co. This was followed by experience in drawing offices in Port Glasgow, Hull and finally in Belfast, where he was responsible for the separate White Star Line drawing office of Harland \& Wolff Ltd, which was then producing the plans for the Atlantic passenger liners Majestic and Teutonic. Following certain unpopular government shipping enactments in 1890, a protest from shipbuilders and shipowners in Ireland, Liverpool and the West of Scotland led to the founding of a new classification society to compete against Lloyd's Register of Shipping. It became known as the British Corporation Register and had headquarters in Glasgow. King was recruited to the staff and by 1903 had become Chief Surveyor, a position he held until his retirement thirty-seven years later. By then the Register was a world leader, with hundreds of thousands of tons of shipping on its books; it acted as consultant to many governments and international agencies. Throughout his working life, King did everything in his power to quantify the risks and problems of ship operation: his contribution to the Load Lines Convention of 1929 was typical, and few major enactments in shipping were designed without his approval. During the inter-war period the performance of the British Corporation outshone that of all rivals, for which King deserved full credit. His especial understanding was for steel structures, and in this respect he ensured that the British Corporation enabled owners to build ships of strengths equal to any others despite using up to 10 per cent less steel within the structure. In 1949 Lloyd's Register of Shipping and the British Corporation merged to form the largest and most influential ship classification society in the world.

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SUBJECT AREA: Architecture and building

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After naval service during the First World War, Fuller worked for some time in the building industry with his father, who was an architect. In 1927 he became interested in trying to solve social problems by providing good, low-cost housing for an expanding population. Utilizing modern techniques applicable in other industries, such as the design of aircraft and ships, he produced his "Dymaxion House", which was transportable and cheap. This was followed in 1946 by his aluminium, stressed-skin, prefabricated house. The geodesic dome is the structural concept for which Fuller is particularly known. It was patented in 1954 and 300,000 were built over a thirty-year period. He had envisaged the dome being utilized on smaller or larger, simple or complex patterns for a wide variety of needs such as enclosing a covered area for a house, a botanical garden, an exhibition pavilion, a factory, a weather station or, indeed, an entire city. A famous example that he designed was that for the US pavilion at Expo '67 in Montreal. A geodesic dome is generally spherical in form, the chief structural elements of which are interconnected in a geodesic pattern, i.e. one in which the lines connecting two points are the shortest possible. The structure is composed of slender, lightweight struts (usually of aluminium) arranged in geometrical patterns, with the metal skeleton covered by a light, plastic material. Inside the dome, all the space is usable and the climate is controllable. Fuller wrote and lectured widely on his patented invention, explaining the importance of structural research particularly in relation to world needs.

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SUBJECT AREA: Chemical technology, Mining and extraction technology, Weapons and armour

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The son of a barber-surgeon who deserted his family to serve in the Swedish army, Nobel showed little interest in academic pursuits as a child and was sent to sea at the age of 16, but jumped ship in Egypt and was eventually employed as an architect by the pasha. Returning to Sweden, he won a scholarship to the Stockholm School of Architecture, where he studied from 1821 to 1825 and was awarded a number of prizes. His interest then leaned towards mechanical matters and he transferred to the Stockholm School of Engineering. Designs for linen-finishing machines won him a prize there, and he also patented a means of transforming rotary into reciprocating movement. He then entered the real-estate business and was successful until a fire in 1833 destroyed his house and everything he owned. By this time he had married and had two sons, with a third, Alfred (of Nobel Prize fame; see Alfred Nobel), on the way. Moving to more modest quarters on the outskirts of Stockholm, Immanuel resumed his inventions, concentrating largely on India rubber, which he applied to surgical instruments and military equipment, including a rubber knapsack.

It was talk of plans to construct a canal at Suez that first excited his interest in explosives. He saw them as a means of making mining more efficient and began to experiment in his backyard. However, this made him unpopular with his neighbours, and the city authorities ordered him to cease his investigations. By this time he was deeply in debt and in 1837 moved to Finland, leaving his family in Stockholm. He hoped to interest the Russians in land and sea mines and, after some four years, succeeded in obtaining financial backing from the Ministry of War, enabling him to set up a foundry and arms factory in St Petersburg and to bring his family over. By 1850 he was clear of debt in Sweden and had begun to acquire a high reputation as an inventor and industrialist. His invention of the horned contact mine was to be the basic pattern of the sea mine for almost the next 100 years, but he also created and manufactured a central-heating system based on hot-water pipes. His three sons, Ludwig, Robert and Alfred, had now joined him in his business, but even so the outbreak of war with Britain and France in the Crimea placed severe pressures on him. The Russians looked to him to convert their navy from sail to steam, even though he had no experience in naval propulsion, but the aftermath of the Crimean War brought financial ruin once more to Immanuel. Amongst the reforms brought in by Tsar Alexander II was a reliance on imports to equip the armed forces, so all domestic arms contracts were abruptly cancelled, including those being undertaken by Nobel. Unable to raise money from the banks, Immanuel was forced to declare himself bankrupt and leave Russia for his native Sweden. Nobel then reverted to his study of explosives, particularly of how to adapt the then highly unstable nitroglycerine, which had first been developed by Ascanio Sobrero in 1847, for blasting and mining. Nobel believed that this could be done by mixing it with gunpowder, but could not establish the right proportions. His son Alfred pursued the matter semi-independently and eventually evolved the principle of the primary charge (and through it created the blasting cap), having taken out a patent for a nitroglycerine product in his own name; the eventual result of this was called dynamite. Father and son eventually fell out over Alfred's independent line, but worse was to follow. In September 1864 Immanuel's youngest son, Oscar, then studying chemistry at Uppsala University, was killed in an explosion in Alfred's laboratory: Immanuel suffered a stroke, but this only temporarily incapacitated him, and he continued to put forward new ideas. These included making timber a more flexible material through gluing crossed veneers under pressure and bending waste timber under steam, a concept which eventually came to fruition in the form of plywood.

In 1868 Immanuel and Alfred were jointly awarded the prestigious Letterstedt Prize for their work on explosives, but Alfred never for-gave his father for retaining the medal without offering it to him.

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