โ Scribed by V.A. Beketov; G.V. Beketov; N.S. Shatlovskaya
No coin nor oath required. For personal study only.
the force is transmitted through the double-armed levers 8 to pins 9 of the movable part of the cryostat. The latter moves in a vertical direction to the stops 10, which fix the upper position of the specimen exactly. On connecting the right-hand part of chamber 1 to the atmosphere, as a result of the weight of the helium reservoir and atmospheric pressure (on pumping the insulating space of the cryostat), the movable part of the cryostat returns to the lower starting position. The split washer 11 is the controlling stop for this lower position.
A commercial 175 mm diameter pneumatic chamber 3 was used in the pneumatic device described. However, some adjustments were required for using it in the given device; in particular a more elastic diaphragm of vacuum rubber was used to increase the working traverse. Also the single central rod was replaced by two, removed from the centre so that the chamber could be as near as possible to the cryostat case.
Operation of the cryostat with the pneumatic drive does not reduce the time for which the liquid helium lasts, which (for the cryostat design used) is 5 to 7 hours under operational conditions for a helium vessel capacity of 0.8 1.
๐ SIMILAR VOLUMES
tricity of the heater and thermometer in the test section, a teledeltos paper model was made simulating the boundary conditions. It was found that no more than 0"3% variation from isothermality was caused by asymmetry. The final analysis was performed to determine heat losses through the epoxy ends,