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242. Extremely sensitive interference micrometer
Classified abstracts 235--258 22 : 26 235. Simple automatic Toepler pump. (South Africa) P G Sevenster and P J Fourie, S African Ind Chem, 18 (11), 1964,
151. 22 236. On the absolute calibration of ionization gauges. (France) The lineanty of the manometer was first checked m the pressure range 10-4 torr using the variable conductance technique The absolute cahb~at~on suggested leads to relating the senstuvity of the manometer with respect to the variable tomc current to the change m absolute pressure, measured using an interferometric manometer. B Aubry and S Choumoff, Compte Rendu Acad Science Paris, 261
(8), August 1965, 1803-1806 22:41 237. Error in the indications of a compression pressure gauge caused by the mercury vapour jet. (USSR) L P Khavkin, Pmbory i Tekh Eksper, 5, 1964, 165-167. 22 : 26 ' 238. Automatic recording McLeod gauge. (USA) P A Faeth, Rev Scient lnstrum, 36 (1), 1965, 106-107. 22 239. Sensitive thermoelectric vacuum meter with thermistors. (USSR) G Grigorov and S Ivanov, Pribory i Tekhn Eksper, 9 (3), 1965, 129-
131, (in Russian). 22 : 37 240. High resolution mass spectro~netrie measurement system for a vacuum fusion apparatus. (USA) R J Conzemius and H T Svec, Anal Chim Acta, 33 (2), 1965, 145-
152. 22 241. Design. construction and operation of a differential micromanometer. Part It. (USA) Theory and operational characteristics. P R Rony, California University, Lawrence Radiation Laboratory,
Berkeley, 1965, UCRL-11218.
chemisorbed material from the grid of a gauge and/or a molecular flux m the gauge are shown to cause a limttation to the lowest measurable pressure; these hmtts may be higher than the X-ray limit under certain conditions. P A Redhead and J P I-lobson, Brit JApplPhys, 16 (10), Oct 1965,
1555-1567. 22 249. Some observations in the measurement of partial pressure with an omegatron. ( Great Britam) The destgn and evaluation of an omegatron capable of the quant~tatlve analysis of the atmosphere in a htgh vacuum system is described. The effect of the complex field dlstrtbutlon upon the movement of ions, both resonant and non-resonant, within the analysis chamber and the reqmrements to achieve optimum resolutton and sensitivity for a gtven geometrical structure are discussed. Experimental observations of the range of operating conditions within which quantitative behaviour is achieved, data obtained during the cahbratlon of the device for mdtvidual gases, and certain hmltmg conditions of operatmn are presented. (Great Britain) J D Buckingham et al, J Sctent Instrum, 42 (10), 1965, 737-742
22 : 32 250. Microwave and fast-acting valves and vacuum couplings for accelerators. (USA) A L Eidredge et al, Trans Nucl Sci, 12 (33), 1965, 694-698, 23, P l u m b i n g 23 251. Linear and angular motion through a vacuum seal. Anon, Rev Scient lnstrum, 36 (9), Sept 1965, 1395.
(USA) 23
252. Metal-to-Pyrex seals. (USA) Anon, Rev Scient lnstrum, 36, Oct 1965, 1528. 23 253. Universal seal. (USA) Anon, Rev Scient lnstrum, 36 (9), Sept 1965, 1395.
22 242. Extremely sensitive interference micromanometer. (USA) Use of a modified Michelson interferometer with a laser source as a level sensor m a micromanometer is described. W H Stevenson and F W McFadden, Rev Scient Instrum, 36 (8),
23 : 36 254. Vacuum-tight seal for low temperature optical windows. ( U S A ) J L Mack and G B Wiimot, Rev Scient Instrum, 36 (8), 1965, 1265-
1965, 1272-1273.
24. V a l v e s
1266.
22
24
243. Calibration of a thermistor vacuum gauge. (USA) J Guon, Rev Scient Instrum, 36 (9), 1965, 1379-1381.
255. Ultra-high vacuum gate valve. (USA) J C Sheffield, Rev Scient Instrum, 36 (8), 1965, 1269-1270.
22 244. The measurement of mass flow and linear velocity of a gas by continuous ionization. (Great Britain) C G Clayton and J W Webb, Inter J Appl Radiation Isotopes, 15
24 256. Development of valves for pumping and other applications.
(10), 1964, 603-610. 22 245. High resolution displacement or pressure recording. (Austraha) A pressure recorder is described incorporating a coarse and fine d~splacement measuring system recording a displacement of 2 × 10-8 m. full scale on the fine range. Wtth a commercmlly available bellows unit, pressure changes of 10 -4 lb in -~ can be detected. Free range accuracy is unaffected by mains voltage fluctuations from 250-150 V. (Great Bmtain) G F Byrne, J Scient Instrum, 42 (10), 1965, 759-760. 22 246. The McLeod manometer. (Great Britain) G R Nicholson, J Scient Instrum, 42 (I0), 1965, 773 22 247. Inexpensive thermocouple vacuum gauge and interlock system.
(Germany) This arttcle rewews the major types of valves avadable to modern industry. (Great Britain) G H Pearson, Pumps, 4, July 1965, 238-244. 24 257. A pumpable vacuum valve for sealed-offmetal cryostats. (Great
Britain) This note describes a valve which forms a connection for re-pumping and seahng off the vacuum space m metal cryostats and simdar eqmpment and also acts as a safety valve. The part that is permanently fastened to the cryostat is designed for cheap and easy quantity production, and the attachment by which it is operated can be shared between many pieces of eqmpment. R Rogers, JScient Instrum, 42 (9), 1065, 724-725.
25. Baffles, traps and refrigeration equipment 25 : 20
( USA ) E J Rogers, Rev Scient lnstrum, 36 (8), 1965, 1243-1244. 22 248. Total pressure measurements below 10 -~° torr with non-magnetic ionization gauges. (Canada) The modulation method has been apphed to (I) the Bayard-Alpert gauge and (2) the suppressor gauge to reduce their lower pressure limits and measurements made with these two gauges to pressures as low as 10 -14 torr. It ~s shown that the modulated Bayard-Alpert gauge can measure pressures to 3 × 10-11 torr (10 per cent error) without correction for the residual-current modulatmn effect, and measurements can be extended to 3 × 10 -la torr if corrections for the residual-current modulation are made. Electronic desorptton of 106
Cadmium trap for obtaining high-vacuum in a mercury diffusion pump system. See abstract number 217. 25 258. Cryogenic level sensor. (USA) J B Hubbs, Chemical Engng, 72 (24), 22 Nov 1965, 175.
26. Automatic protective and control equipment 26 : 21 Scale effect in turbomaehines. See abstract number 221. 26 : 27 Simple automatic Toepler pump. see abstract number 235.
151. 22 236. On the absolute calibration of ionization gauges. (France) The lineanty of the manometer was first checked m the pressure range 10-4 torr using the variable conductance technique The absolute cahb~at~on suggested leads to relating the senstuvity of the manometer with respect to the variable tomc current to the change m absolute pressure, measured using an interferometric manometer. B Aubry and S Choumoff, Compte Rendu Acad Science Paris, 261
(8), August 1965, 1803-1806 22:41 237. Error in the indications of a compression pressure gauge caused by the mercury vapour jet. (USSR) L P Khavkin, Pmbory i Tekh Eksper, 5, 1964, 165-167. 22 : 26 ' 238. Automatic recording McLeod gauge. (USA) P A Faeth, Rev Scient lnstrum, 36 (1), 1965, 106-107. 22 239. Sensitive thermoelectric vacuum meter with thermistors. (USSR) G Grigorov and S Ivanov, Pribory i Tekhn Eksper, 9 (3), 1965, 129-
131, (in Russian). 22 : 37 240. High resolution mass spectro~netrie measurement system for a vacuum fusion apparatus. (USA) R J Conzemius and H T Svec, Anal Chim Acta, 33 (2), 1965, 145-
152. 22 241. Design. construction and operation of a differential micromanometer. Part It. (USA) Theory and operational characteristics. P R Rony, California University, Lawrence Radiation Laboratory,
Berkeley, 1965, UCRL-11218.
chemisorbed material from the grid of a gauge and/or a molecular flux m the gauge are shown to cause a limttation to the lowest measurable pressure; these hmtts may be higher than the X-ray limit under certain conditions. P A Redhead and J P I-lobson, Brit JApplPhys, 16 (10), Oct 1965,
1555-1567. 22 249. Some observations in the measurement of partial pressure with an omegatron. ( Great Britam) The destgn and evaluation of an omegatron capable of the quant~tatlve analysis of the atmosphere in a htgh vacuum system is described. The effect of the complex field dlstrtbutlon upon the movement of ions, both resonant and non-resonant, within the analysis chamber and the reqmrements to achieve optimum resolutton and sensitivity for a gtven geometrical structure are discussed. Experimental observations of the range of operating conditions within which quantitative behaviour is achieved, data obtained during the cahbratlon of the device for mdtvidual gases, and certain hmltmg conditions of operatmn are presented. (Great Britain) J D Buckingham et al, J Sctent Instrum, 42 (10), 1965, 737-742
22 : 32 250. Microwave and fast-acting valves and vacuum couplings for accelerators. (USA) A L Eidredge et al, Trans Nucl Sci, 12 (33), 1965, 694-698, 23, P l u m b i n g 23 251. Linear and angular motion through a vacuum seal. Anon, Rev Scient lnstrum, 36 (9), Sept 1965, 1395.
(USA) 23
252. Metal-to-Pyrex seals. (USA) Anon, Rev Scient lnstrum, 36, Oct 1965, 1528. 23 253. Universal seal. (USA) Anon, Rev Scient lnstrum, 36 (9), Sept 1965, 1395.
22 242. Extremely sensitive interference micromanometer. (USA) Use of a modified Michelson interferometer with a laser source as a level sensor m a micromanometer is described. W H Stevenson and F W McFadden, Rev Scient Instrum, 36 (8),
23 : 36 254. Vacuum-tight seal for low temperature optical windows. ( U S A ) J L Mack and G B Wiimot, Rev Scient Instrum, 36 (8), 1965, 1265-
1965, 1272-1273.
24. V a l v e s
1266.
22
24
243. Calibration of a thermistor vacuum gauge. (USA) J Guon, Rev Scient Instrum, 36 (9), 1965, 1379-1381.
255. Ultra-high vacuum gate valve. (USA) J C Sheffield, Rev Scient Instrum, 36 (8), 1965, 1269-1270.
22 244. The measurement of mass flow and linear velocity of a gas by continuous ionization. (Great Britain) C G Clayton and J W Webb, Inter J Appl Radiation Isotopes, 15
24 256. Development of valves for pumping and other applications.
(10), 1964, 603-610. 22 245. High resolution displacement or pressure recording. (Austraha) A pressure recorder is described incorporating a coarse and fine d~splacement measuring system recording a displacement of 2 × 10-8 m. full scale on the fine range. Wtth a commercmlly available bellows unit, pressure changes of 10 -4 lb in -~ can be detected. Free range accuracy is unaffected by mains voltage fluctuations from 250-150 V. (Great Bmtain) G F Byrne, J Scient Instrum, 42 (10), 1965, 759-760. 22 246. The McLeod manometer. (Great Britain) G R Nicholson, J Scient Instrum, 42 (I0), 1965, 773 22 247. Inexpensive thermocouple vacuum gauge and interlock system.
(Germany) This arttcle rewews the major types of valves avadable to modern industry. (Great Britain) G H Pearson, Pumps, 4, July 1965, 238-244. 24 257. A pumpable vacuum valve for sealed-offmetal cryostats. (Great
Britain) This note describes a valve which forms a connection for re-pumping and seahng off the vacuum space m metal cryostats and simdar eqmpment and also acts as a safety valve. The part that is permanently fastened to the cryostat is designed for cheap and easy quantity production, and the attachment by which it is operated can be shared between many pieces of eqmpment. R Rogers, JScient Instrum, 42 (9), 1065, 724-725.
25. Baffles, traps and refrigeration equipment 25 : 20
( USA ) E J Rogers, Rev Scient lnstrum, 36 (8), 1965, 1243-1244. 22 248. Total pressure measurements below 10 -~° torr with non-magnetic ionization gauges. (Canada) The modulation method has been apphed to (I) the Bayard-Alpert gauge and (2) the suppressor gauge to reduce their lower pressure limits and measurements made with these two gauges to pressures as low as 10 -14 torr. It ~s shown that the modulated Bayard-Alpert gauge can measure pressures to 3 × 10-11 torr (10 per cent error) without correction for the residual-current modulatmn effect, and measurements can be extended to 3 × 10 -la torr if corrections for the residual-current modulation are made. Electronic desorptton of 106
Cadmium trap for obtaining high-vacuum in a mercury diffusion pump system. See abstract number 217. 25 258. Cryogenic level sensor. (USA) J B Hubbs, Chemical Engng, 72 (24), 22 Nov 1965, 175.
26. Automatic protective and control equipment 26 : 21 Scale effect in turbomaehines. See abstract number 221. 26 : 27 Simple automatic Toepler pump. see abstract number 235.