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61 Todd, Leonard Jennett
SUBJECT AREA: Steam and internal combustion engines[br]fl. 1885 London, England[br]English (?) patentee of steam engines incorporating the uniflow principle.[br]In a uniflow system, the steam enters a steam engine cylinder at one end, pushes the pistons along, and exhausts through a ring of ports at the centre of the cylinder that are uncovered by movement of the piston. The piston is returned by steam then entering the other end of the cylinder, moving the piston arrangement back, and again making its exit through the central ports. This gave the thermodynamic advantage of the cylinder ends remaining hot and the centre colder with reheating the ends of the cylinder through compression of the residual steam. The principle was first patented by Jacob Perkins in England in 1827 and was tried in America in 1856.Little is known about Todd. The addresses given in his patent specifications show that he was living first at South Hornsey and then Stoke Newington, both in Middlesex (now in London). No obituary notices have been traced. He took out a patent in 1885 for a "terminal exhaust engine" and followed this with two more in 1886 and 1887. His aim was to "produce a double acting steam engine which shall work more efficiently, which shall produce and maintain within itself an improved gradation of temperature extending from each of its two Hot Inlets to its common central Cold Outlet". His later patents show the problems he faced with finding suitable valve gears and the compression developing during the return stroke of the piston. It was this last problem, particularly when starting a condensing engine, that probably defeated him through excessive compression pressures. There is some evidence that he hoped to apply his engines to railway locomotives.[br]Bibliography1885, British patent no. 7,301 (terminal exhaust engine). 1886, British patent no. 2,132.1887, British patent no. 6,666.Further ReadingR.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (provides the fullest discussion of his patents). H.W.Dickinson, 1938, A Short History of the Steam Engine, Cambridge University Press.J.Stumpf, 1912, The Una-Flow Steam Engine, Munich: R.Oldenbourg.RLH -
62 инспекция по технике безопасности
Русско-английский научный словарь > инспекция по технике безопасности
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63 коэффициент безопасности
1. assurance coefficient2. safety factorРусско-английский научный словарь > коэффициент безопасности
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64 пожарная безопасность
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65 степень безопасности
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66 технический
1. technical[lang name="Russian"]технические условия; спецификация — technical specifications
2. engineering -
67 обеспечивать безопасность
Русско-английский новый политехнический словарь > обеспечивать безопасность
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68 обеспечивающий безопасность
Русско-английский новый политехнический словарь > обеспечивающий безопасность
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69 радиационная безопасность
Русско-английский новый политехнический словарь > радиационная безопасность
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70 техника безопасности
Русско-английский новый политехнический словарь > техника безопасности
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71 зона безопасности
1. safety zone2. safety areaРусско-английский военно-политический словарь > зона безопасности
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72 коэффициент безопасности
Русско-английский военно-политический словарь > коэффициент безопасности
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73 линия безопасности
Русско-английский военно-политический словарь > линия безопасности
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74 обеспечение безопасности
Русско-английский военно-политический словарь > обеспечение безопасности
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75 полоса безопасности
Русско-английский военно-политический словарь > полоса безопасности
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76 проектная безопасность
Русско-английский военно-политический словарь > проектная безопасность
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77 разработаешь
Русско-английский военно-политический словарь > разработаешь
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78 стандарт безопасности
Русско-английский военно-политический словарь > стандарт безопасности
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79 табличка по условиям безопасности
Русско-английский военно-политический словарь > табличка по условиям безопасности
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80 требование безопасности
Русско-английский военно-политический словарь > требование безопасности
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