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114. Transistorized liquid helium temperature regulator
Classified abstracts 111-124 conditions. The total weight of the monitor, including ancillary equipment, is 4.5 kg. V G Anikin and I A Okorokov, lzmerit Tekh, No 5,1966, 83 (in Russian). 26 111. Clamps for mechanical tests over a wide range of temperatures in vacuo. (USSR) Multiposition clamps designed for the rapid and automatic interchange of samples under mechanical test are described. The samples are interchanged by rotating the upper member of the clamping system together with the samples. The equipment is designed for testing round and rectangular metal and plastic samples at liquidhelium temperatures. Practical tests have shown this clamping system to be both reliable and convenient; tests can be carried out more quickly than with traditional equipment, and the expenditure of cryogenic fluid is reduced. A similar system may be used at high temperatures both in vacuo and at normal pressures. V Ya II'ichev et al, Zavodsk Lab, 32 (9), 1966, 1133 (in Russian). 26 112. A Mueller bridge set for cryogenic temperature measurements.
(Great Britain) An ac Mueller bridge set for resistance thermometry at cryogenic temperature is described. A commercial tuned null detector is used at an operating frequency of 1025 c/s. The set includes a high stability oscillator, line reject filter, phase shifter, Q multiplier and selector box. A temperature change of the order of 10~°K can be detected, with 10-~ W applied to the thermometer. J M Diamond, J Sci Instrum, 43, 1966, 576-580. 26 113. Low temperature liquid helium level indicator. (USA) A level indicator capable of detecting the liquid level in an opaque dewar in the temperature range of below I°K to above 4.2°K is described. A high current electronic switch has been designed so that only one calibration of the instrument is necessary for the entire temperature range. K F Canter and L O Roellig, Rev Sci lnstrum, 37, 1966, 1165-1167. 26 114. Transistorized liquid helium temperature regulator. (USA) A regulator capable of controlling the temperature of a liquid He bath to better than =1=10~t°K for periods of 20-50 minutes is described. J D C Lindsay, Rev Sci Instrum, 37, 1966, 1192-1195. 26 115. Vacuum control circuit. (USA) A simple circuit, consisting of relays and switches, has been designed to monitor and control a vacuum system built for chemical manipulations. I Sheft and D J Lind, Rev Sci lnstrum, 37 (9), 1966, 1272-1273. 26 116. Apparatus for transporting the substrates of film systems in vaeuo. (USSR) An improvement in the conventional apparatus used for transporting the substrates of film systems in vacuo is described. The conventional arrangement contains two drums bearing a flexible strip and a simple drive mechanism; the strip tends to sag in the course of rewinding. In the new version, sag is eliminated and the transporting system simplifed by means of a pair of helically-grooved conical pulleys installed on the drum axes; a cord runs in the grooves and interlocks the motion of the pulleys. The transporting element itself consists of a comb with teeth meshing in perforations of the flexible strip. A A Vasil'kovskii et al, USSR Patent No 174,239, Appl 18th April
1964, publ'd 8th Oct 1965 (in Russian). 26 117. Apparatus for opening and protecting evacuated monitoring units. (USSR) The defects of existing apparatus for the opening of evacuated monitoring units in gaseous media are discussed. Conventional systems incorporating a bell jar and a mechanism for breaking this are in general unsatisfactory, owing to the danger of damaging the sensitive element. A new system in which the hermetically-sealed bell jar is made of two adjacent metal surfaces connected with each other and with the rest of the apparatus through glass seals is made of two adjacent metal surfaces connected with each other and with the rest of the apparatus through glass seals is described. The metal system is provided with attachments leading to the breaking mechanism. This arrangement ensures that the medium under examination should fall directly into the monitoring unit and also protects the latter from damage on opening.
O E Lebedev et aL (Special-Construction Bureau of Analytical
Apparatus Construction, Academy of Sciences, USSR), USSR Patent No 175,398, Appl 12th Oct 1964, publ'd 1st Dec 1965 (in Russian). 26 118. Apparatus for controlling the level of a product in a vacuum system. ( USSR) An apparatus for controlling the level of a product in a vacuum system (eg, in the evaporation of milk) is described. This contains a conductometric detector set up in the vessel concerned; the detector communicates with the vacuum apparatus at one end and with a vacuum line, relay, and stopcock at the other. The distinguishing feature of this system is that the vessel is connected to the lower part of the vacuum apparatus through a coil from which a system of vertical tubes passes to the vacuum line. A M Gusev, USSR Patent No 178,510, Appl 6th Aug 1964, publ'd 4th
March 1966. 26 119. Vacuum suction device. (USSR) A vacuum suction device for lifting and transporting sheet material is proposed. This comprises a system of pumps connected to a vacuum collector and sprung suction heads communicating with the collector through channels. A particular feature of the apparatus is the provision of a valve system in the form of ball valves communicating with the suction heads; these are controlled by electromagnets and ensure reliable operation of the heads when handling dusty or corrugated sheet. V I Rospasienko et al, USSR Patent No 182,312, Appl lOth May 1965,
publ'd 25th May 1966.
27. Leak detectors and leak detection 27 : 47 Methods of leak detection and applications to leakage by porosity diffusion. See abstract number 256. 27 120. New high sensitivity leak detector with an ion source capable of handling high pressure intakes. (France) The leak detector has a doubly focusing analyzer and incorporates a special arrangement providing for an extremely low background effect on the ion collector. The analyzer compartment may be evacuated by an air-cooled oil diffusion pump without a low temperature trap. The ion source is designed to operate with a tungsten cathode or thorium oxide coated cathode at pressures up to 10-2 tort. K H Mirgel and G Mabit, Le Vide, 122, 1966, 152-156 (in French). 27 121. Mass spectrometer head attachment capable of measuring leaks in the range 10-6 to 10-~ ton'. (France) Mass spectrometer head attachment and control equipment specially designed for an ultrahigh vacuum leak detector is described. This unit is derived from the standard leak detector mass spectrometer and has found application in testing large vacuum chambers, ultrahigh vacuum systems, and accelerators. J Bargery and P Jalenques, Le Vide, 122, 1966, 167-170 (in French).
28. Heating equipment and thermometers 28 122. High-frequency thermometry. (USA) Recent advances in the technology of fast-response thermal detectors and their application to the measurement of short-time thermal transport effects have made it expedient to make some theoretical estimates with which the experimental results may be compared. M Chester, Phys Rev, 145, 1966, 76-80. 28 123. Developments in high temperature ultrahigh vacuum friction studies. (USA) An extensive survey was made of sliding friction at high temperature under high vacuum (less 10-7 tort) of the following sliding combinations: metal on metal, metal on metal with dry lubricant, ceramic on ceramic, ceramic on ceramic with dry lubricant, metal on ceramic, and ceramic carbon. In the absence of a dry lubricant, high friction, plowing and seizure occurred. L G Kellog, Lubrication Eng, 22, 1966, 57-66. 28 124. Wide range thermostat for M~ssbaner spectroscopy. (USA) A vacuum thermostat for M~Sssbauer effect studies permitting temperature control from 85 to 870°K is described. Any temperature
59
(Great Britain) An ac Mueller bridge set for resistance thermometry at cryogenic temperature is described. A commercial tuned null detector is used at an operating frequency of 1025 c/s. The set includes a high stability oscillator, line reject filter, phase shifter, Q multiplier and selector box. A temperature change of the order of 10~°K can be detected, with 10-~ W applied to the thermometer. J M Diamond, J Sci Instrum, 43, 1966, 576-580. 26 113. Low temperature liquid helium level indicator. (USA) A level indicator capable of detecting the liquid level in an opaque dewar in the temperature range of below I°K to above 4.2°K is described. A high current electronic switch has been designed so that only one calibration of the instrument is necessary for the entire temperature range. K F Canter and L O Roellig, Rev Sci lnstrum, 37, 1966, 1165-1167. 26 114. Transistorized liquid helium temperature regulator. (USA) A regulator capable of controlling the temperature of a liquid He bath to better than =1=10~t°K for periods of 20-50 minutes is described. J D C Lindsay, Rev Sci Instrum, 37, 1966, 1192-1195. 26 115. Vacuum control circuit. (USA) A simple circuit, consisting of relays and switches, has been designed to monitor and control a vacuum system built for chemical manipulations. I Sheft and D J Lind, Rev Sci lnstrum, 37 (9), 1966, 1272-1273. 26 116. Apparatus for transporting the substrates of film systems in vaeuo. (USSR) An improvement in the conventional apparatus used for transporting the substrates of film systems in vacuo is described. The conventional arrangement contains two drums bearing a flexible strip and a simple drive mechanism; the strip tends to sag in the course of rewinding. In the new version, sag is eliminated and the transporting system simplifed by means of a pair of helically-grooved conical pulleys installed on the drum axes; a cord runs in the grooves and interlocks the motion of the pulleys. The transporting element itself consists of a comb with teeth meshing in perforations of the flexible strip. A A Vasil'kovskii et al, USSR Patent No 174,239, Appl 18th April
1964, publ'd 8th Oct 1965 (in Russian). 26 117. Apparatus for opening and protecting evacuated monitoring units. (USSR) The defects of existing apparatus for the opening of evacuated monitoring units in gaseous media are discussed. Conventional systems incorporating a bell jar and a mechanism for breaking this are in general unsatisfactory, owing to the danger of damaging the sensitive element. A new system in which the hermetically-sealed bell jar is made of two adjacent metal surfaces connected with each other and with the rest of the apparatus through glass seals is made of two adjacent metal surfaces connected with each other and with the rest of the apparatus through glass seals is described. The metal system is provided with attachments leading to the breaking mechanism. This arrangement ensures that the medium under examination should fall directly into the monitoring unit and also protects the latter from damage on opening.
O E Lebedev et aL (Special-Construction Bureau of Analytical
Apparatus Construction, Academy of Sciences, USSR), USSR Patent No 175,398, Appl 12th Oct 1964, publ'd 1st Dec 1965 (in Russian). 26 118. Apparatus for controlling the level of a product in a vacuum system. ( USSR) An apparatus for controlling the level of a product in a vacuum system (eg, in the evaporation of milk) is described. This contains a conductometric detector set up in the vessel concerned; the detector communicates with the vacuum apparatus at one end and with a vacuum line, relay, and stopcock at the other. The distinguishing feature of this system is that the vessel is connected to the lower part of the vacuum apparatus through a coil from which a system of vertical tubes passes to the vacuum line. A M Gusev, USSR Patent No 178,510, Appl 6th Aug 1964, publ'd 4th
March 1966. 26 119. Vacuum suction device. (USSR) A vacuum suction device for lifting and transporting sheet material is proposed. This comprises a system of pumps connected to a vacuum collector and sprung suction heads communicating with the collector through channels. A particular feature of the apparatus is the provision of a valve system in the form of ball valves communicating with the suction heads; these are controlled by electromagnets and ensure reliable operation of the heads when handling dusty or corrugated sheet. V I Rospasienko et al, USSR Patent No 182,312, Appl lOth May 1965,
publ'd 25th May 1966.
27. Leak detectors and leak detection 27 : 47 Methods of leak detection and applications to leakage by porosity diffusion. See abstract number 256. 27 120. New high sensitivity leak detector with an ion source capable of handling high pressure intakes. (France) The leak detector has a doubly focusing analyzer and incorporates a special arrangement providing for an extremely low background effect on the ion collector. The analyzer compartment may be evacuated by an air-cooled oil diffusion pump without a low temperature trap. The ion source is designed to operate with a tungsten cathode or thorium oxide coated cathode at pressures up to 10-2 tort. K H Mirgel and G Mabit, Le Vide, 122, 1966, 152-156 (in French). 27 121. Mass spectrometer head attachment capable of measuring leaks in the range 10-6 to 10-~ ton'. (France) Mass spectrometer head attachment and control equipment specially designed for an ultrahigh vacuum leak detector is described. This unit is derived from the standard leak detector mass spectrometer and has found application in testing large vacuum chambers, ultrahigh vacuum systems, and accelerators. J Bargery and P Jalenques, Le Vide, 122, 1966, 167-170 (in French).
28. Heating equipment and thermometers 28 122. High-frequency thermometry. (USA) Recent advances in the technology of fast-response thermal detectors and their application to the measurement of short-time thermal transport effects have made it expedient to make some theoretical estimates with which the experimental results may be compared. M Chester, Phys Rev, 145, 1966, 76-80. 28 123. Developments in high temperature ultrahigh vacuum friction studies. (USA) An extensive survey was made of sliding friction at high temperature under high vacuum (less 10-7 tort) of the following sliding combinations: metal on metal, metal on metal with dry lubricant, ceramic on ceramic, ceramic on ceramic with dry lubricant, metal on ceramic, and ceramic carbon. In the absence of a dry lubricant, high friction, plowing and seizure occurred. L G Kellog, Lubrication Eng, 22, 1966, 57-66. 28 124. Wide range thermostat for M~ssbaner spectroscopy. (USA) A vacuum thermostat for M~Sssbauer effect studies permitting temperature control from 85 to 870°K is described. Any temperature
59