a Mr Arnold

Arnold-Chiari-Syndrom n, Arnold-Chiarische Mißbildung f ( Hemmungsmißbildung des Kleinhirns)

Arnold-Chiari malformation

SUBJECT AREA: Horology

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John Arnold was apprenticed to his father, a watchmaker, and then worked as an itinerant journeyman in the Low Countries and, later, in England. He settled in London in 1762 and rapidly established his reputation at Court by presenting George III with a miniature repeating watch mounted in a ring. He later abandoned the security of the Court for a more precarious living developing his chronometers, with some financial assistance from the Board of Longitude. Symbolically, in 1771 he moved from the vicinity of the Court at St James's to John Adam Street, which was close to the premises of the Royal Society for the Encouragement of Arts, Manufactures \& Commerce.

By the time Arnold became interested in chronometry, Harrison had already demonstrated that longitude could be determined by means of a timekeeper, and the need was for a simpler instrument that could be sold at an affordable price for universal use at sea. Le Roy had shown that it was possible to dispense with a remontoire by using a detached escapement with an isochronous balance; Arnold was obviously thinking along the same lines, although he may not have been aware of Le Roy's work. By 1772 Arnold had developed his detached escapement, a pivoted detent which was quite different from that used on the European continent, and three years later he took out a patent for a compensation balance and a helical balance spring (Arnold used the spring in torsion and not in tension as Harrison had done). His compensation balance was similar in principle to that described by Le Roy and used riveted bimetallic strips to alter the radius of gyration of the balance by moving small weights radially. Although the helical balance spring was not completely isochronous it was a great improvement on the spiral spring, and in a later patent (1782) he showed how it could be made more truly isochronous by shaping the ends. In this form it was used universally in marine chronometers.

Although Arnold's chronometers performed well, their long-term stability was less satisfactory because of the deterioration of the oil on the pivot of the detent. In his patent of 1782 he eliminated this defect by replacing the pivot with a spring, producing the spring detent escapement. This was also done independendy at about the same time by Berthoud and Earnshaw, although Earnshaw claimed vehemently that Arnold had plagiarized his work. Ironically it was Earnshaw's design that was finally adopted, although he had merely replaced Arnold's pivoted detent with a spring, while Arnold had completely redesigned the escapement. Earnshaw also improved the compensation balance by fusing the steel to the brass to form the bimetallic element, and it was in this form that it began to be used universally for chronometers and high-grade watches.

As a result of the efforts of Arnold and Earnshaw, the marine chronometer emerged in what was essentially its final form by the end of the eighteenth century. The standardization of the design in England enabled it to be produced economically; whereas Larcum Kendall was paid £500 to copy Harrison's fourth timekeeper, Arnold was able to sell his chronometers for less than one-fifth of that amount. This combination of price and quality led to Britain's domination of the chronometer market during the nineteenth century.

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See also: Phillips, Edouard

SUBJECT AREA: Textiles

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He was the son of Benjamin and Isabel Arnold, but his mother died when he was 2 years old and after his father's second marriage he was largely left to look after himself. After attending the village school he learnt the trade of a carpenter, and following this he became a machinist. He entered the employment of Samuel Slater, but left after a few years to engage in the unsuccessful manufacture of woollen blankets. He became involved in an engineering shop, where he devised a machine for taking wool off a carding machine and making it into endless slivers or rovings for spinning. He then became associated with a cotton-spinning mill, which led to his most important invention. The carded cotton sliver had to be reduced in thickness before it could be spun on the final machines such as the mule or the waterframe. The roving, as the mass of cotton fibres was called at this stage, was thin and very delicate because it could not be twisted to give strength, as this would not allow it to be drawn out again during the next stage. In order to wind the roving on to bobbins, the speed of the bobbin had to be just right but the diameter of the bobbin increased as it was filled. Obtaining the correct reduction in speed as the circumference increased was partially solved by the use of double-coned pulleys, but the driving belt was liable to slip owing to the power that had to be transmitted.

The final solution to the problem came with the introduction of the differential drive with bevel gears or a sun-and-planet motion. Arnold had invented this compound motion in 1818 but did not think of applying it to the roving frame until 1820. It combined the direct-gearing drive from the main shaft of the machine with that from the cone-drum drive so that the latter only provided the difference between flyer and bobbin speeds, which meant that most of the transmission power was taken away from the belt. The patent for this invention was issued to Arnold on 23 January 1823 and was soon copied in Britain by Henry Houldsworth, although J.Green of Mansfield may have originated it independendy in the same year. Arnold's patent was widely infringed in America and he sued the Proprietors of the Locks and Canals, machine makers for the Lowell manufacturers, for $30,000, eventually receiving $3,500 compensation. Arnold had his own machine shop but he gave it up in 1838 and moved the Philadelphia, where he operated the Mulhausen Print Works. Around 1850 he went to Washington, DC, and became a patent attorney, remaining as such until his death. On 24 June 1856 he was granted patent for a self-setting and self-raking saw for sawing machines.

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1 Arnold, Benedict Arnold.

2 Arnold, Mateo Arnold.

3 Arnoldo.

nome Arnoldo

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nome Arnoldo

conducto de Arnold, canal de Arnold.

1916-1992

   Nacido el 14 de octubre de 1916 en New Haven, Connecticut, de padres rusos. La prosperidad familiar estuvo ligada al traslado a Nueva York, donde Arnold sintio despertar su vocacion teatral. Despues del derrumbe economico norteamericano de 1929 la familia quedo casi en la ruina, por lo que el joven Jack se determino, mas si cabe, a hacer carrera en el teatro. Su primera experiencia cinematografica fue curiosa: con una camara Kodak, modelo K, de 16 mm, filmo las obras de teatro en que no participaba, vendiendo copias a los actores. Durante la guerra, hizo un curso de cine en 1942, con objeto de presentarse en los Estudios Astoria de la Paramount pa ra optar al puesto de operador. Fue asignado a Ro bert Flaherty como asistente, con el que permanecio ocho meses. Despues de la guerra volvio a su trabajo teatral y, entre 1947 y 1949, rodo algunos cortos promocionales, antes de debutar en la realizacion de largometrajes con el filme de tono do cumental Whit These Hands (1950), sobre el mundo de la confeccion. El exito de la pelicula le abrio las puertas de la Universal, para la que rodaria, en primer lugar, la irrelevante Girls in the Night (1953). Entre 1953 y 1955 realizara otras cuatro peliculas, en el efimero sistema 3-D, que le permitiran ir afinando un estilo cinematografico propio, especialmente adecuado para producciones no demasiado costosas. Estuvo en la Uni versal hasta 1958, y despues, sin abandonarla del todo, dirigio peliculas para MGM, Paramount y otros estudios, hasta que, en 1976, despues del filme de accion Conspiracion en Suiza (The Swiss Cons piracy), se refugio en el medio televisivo. Estamos, sin lugar a dudas, ante uno de los grandes directores de la serie B, aunque serie B “de lujo”, con peliculas en su haber tan formidables como La mujer y el monstruo (Creature from the Black Lagoon, 1954), o The Incredible Shrinking Man (1957), no estrenada oficialmente en Espana pero conocida como El increible hombre menguante. Arnold es, sin duda, uno de los grandes del cine fantastico, pero tiene tambien al menos un western magnifico e inquietante, Sangre en el rancho.

   FILMOGRAFIA

    The Man from Bitter Ridge. 1955. 80 minutos. Eastmancolor. Universal. Lex Barker, Mara Corday, Stephen McNally.

    Red Sundown. 1956. 82 minutos. Technicolor. Universal. Rory Calhoun, Martha Hyer, Dean Jagger.

    Man in the Shadow (Sangre en el rancho). 1957. 80 min. Blanco y Negro. CinemaScope. Universal. Jeff Chandler, Orson Welles, Colleen Miller.

    No Name on the Bullet. 1959. 77 minutos. Eastmancolor. CinemaScope. Universal. Audie Murphy, Joan Evans, Charles Drake, Virginia Grey.

    Boss Niger. 1975. 87 minutos. Color DeLuxe. Todd-AO 35. Dimension Pic tures. Fred Williamson, D’Urville Martin, R.G. Armstrong, Barbara Leigh.

    The Wackiest Wagon Train in the West (co-d.: Earl Bellamy, Bruce Bilson, Oscar Rudolph). 1976. 86 minutos. Color. Topar Films. Bob Denver, Forrest Tucker, Jeannine Riley.

1) Общая лексика: Арнолд (мужское имя), Арнольд (мужское имя)

2) Сленг: простофиля (He's a right Arnold.), балбес, дурак

n. Arnold (voornaam)

n. Arnold Zweig, (1887-1968) Duitse schrijver

n. Arnold (förnamn)

см Arnold, Benedict

тж Arnold

Арнольд (Arnold)

deformidad de Arnold-Chiari.