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698. High-temperature vacuum chamber for inverse photography
Classified Abstracts
284
Vacuum 20.
Apparatus
Pumping Systems
20 695. Glass high vacuum system for thin film study. (Great Britain) Anon., Electronic Engng, 35, July 1963, 438. 696. Vacuum system for microcircuit production. Anon., Engineer, 217 (5638), 14 Feb. 1964, 317.
20 (Great Britain) 20
697. Portable vacuum units. (Great Britain) Anon., Nuclear Engng., 9 (94), March 1964, 110. 20 698. High-temperature vacuum chamber for inverse photography. (U.S.S.R.) N. N. Matyushenko, V. V. Kunchenko and L. F. Verkhorobin, Zndustr. Lab., 28 (lo), June 1963, 1335-1337 ; translated from the Russian in Zavod. Lab., 28 (lo), Oct. 1962, 1257-1259. 21.
695-740 and Auxiliaries
used as cold jointing low vapour pressure materials in vacuum tube devices. The alloys can be classed as amalgams, which harden at room temperature after packing or squeezing into position. All the alloys expand on hardening, so that in addition to a diffusion reaction, the joint can be strengthened by suitable component design to provide a locking action. The most useful ones can be baked at 450°C. The vapour pressure of gold, tin and gallium are less than lo- I1 torr at that temperature, so satisfactory vacuum behaviour of the jointing material is ensured. Moreover, baking does not change the physical characteristics of the alloys. The only disadvantage of the new material is the short pot life and long setting time compared with brazing materials which must be melted. M. Hillier and H. Bennett, Design Electronics, April 1964.
702. A simple method for vacuum sealing radioactive sources. (Netherlands) R. A. Llewellyn, Nuclear Znstrum. & Meth., 25(l), Dec. 1963, 171-172.
Pumps and Pump Fluids 21
699. Vapour diffusion vacuum pump. (Great Britain) Anon., Engineer, 217 (5638), 14 Feb. 1964, 320.
26.
Automatic Protective and Control Equipment 26
22.
Gauges
22 700. Semiconductor vacuum gauge. (U.S.S.R.) A. V. Bulyga and A. G. Shashkov, Znzhen. Fiz. Zh., 6 (12), Dec. 1963,95-100.
703. Vacuum switching. (Great Brituin) Anon., Engineer, 217 (5637) 7 Feb. 1964,266-268.
27.
Leak Detectors and Leak Detection 27
23.
Plumbing
23 701. Hard gallium alloys. Alloys of gallium with gold, tin, copper and other metals can be
704. Leak detector. (Great Britain) Semi-automatic leak detector. Sensitivity claimed IO-l4 atmospheric litres of helium per second. Anon., Electron. Equip. News, 5, Feb. 1964, 27.
is down to
284
Vacuum 20.
Apparatus
Pumping Systems
20 695. Glass high vacuum system for thin film study. (Great Britain) Anon., Electronic Engng, 35, July 1963, 438. 696. Vacuum system for microcircuit production. Anon., Engineer, 217 (5638), 14 Feb. 1964, 317.
20 (Great Britain) 20
697. Portable vacuum units. (Great Britain) Anon., Nuclear Engng., 9 (94), March 1964, 110. 20 698. High-temperature vacuum chamber for inverse photography. (U.S.S.R.) N. N. Matyushenko, V. V. Kunchenko and L. F. Verkhorobin, Zndustr. Lab., 28 (lo), June 1963, 1335-1337 ; translated from the Russian in Zavod. Lab., 28 (lo), Oct. 1962, 1257-1259. 21.
695-740 and Auxiliaries
used as cold jointing low vapour pressure materials in vacuum tube devices. The alloys can be classed as amalgams, which harden at room temperature after packing or squeezing into position. All the alloys expand on hardening, so that in addition to a diffusion reaction, the joint can be strengthened by suitable component design to provide a locking action. The most useful ones can be baked at 450°C. The vapour pressure of gold, tin and gallium are less than lo- I1 torr at that temperature, so satisfactory vacuum behaviour of the jointing material is ensured. Moreover, baking does not change the physical characteristics of the alloys. The only disadvantage of the new material is the short pot life and long setting time compared with brazing materials which must be melted. M. Hillier and H. Bennett, Design Electronics, April 1964.
702. A simple method for vacuum sealing radioactive sources. (Netherlands) R. A. Llewellyn, Nuclear Znstrum. & Meth., 25(l), Dec. 1963, 171-172.
Pumps and Pump Fluids 21
699. Vapour diffusion vacuum pump. (Great Britain) Anon., Engineer, 217 (5638), 14 Feb. 1964, 320.
26.
Automatic Protective and Control Equipment 26
22.
Gauges
22 700. Semiconductor vacuum gauge. (U.S.S.R.) A. V. Bulyga and A. G. Shashkov, Znzhen. Fiz. Zh., 6 (12), Dec. 1963,95-100.
703. Vacuum switching. (Great Brituin) Anon., Engineer, 217 (5637) 7 Feb. 1964,266-268.
27.
Leak Detectors and Leak Detection 27
23.
Plumbing
23 701. Hard gallium alloys. Alloys of gallium with gold, tin, copper and other metals can be
704. Leak detector. (Great Britain) Semi-automatic leak detector. Sensitivity claimed IO-l4 atmospheric litres of helium per second. Anon., Electron. Equip. News, 5, Feb. 1964, 27.
is down to