ISSN:0034-6748    

DOI:10.1063/1.1752320

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

The construction and operation of a torsion manometer for the measurement of the force exerted by a molecular ray is described. The manometer was used to measure the vapor pressures of KCl and CsI crystals in the range of temperature 800–950°K. The results obtained suggest that it is possible to develop this method to a degree where it will yield data at least as accurate as that obtained by other methods. Some applications of the torsion manometer are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1752321

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

In a previous paper having the above title a numerical error was made in the calculations. This is corrected, and experimental results on a small iron magnet are described.

ISSN:0034-6748    

DOI:10.1063/1.1752322

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

A circuit has been developed in which grid glow tubes with time delay inputs perform all the switching operations necessary to operate a Wilson cloud chamber and its accessory mechanisms. The cycle of operations can be initiated either at regular intervals (by a motor and reduction gear) or by coincidences in Geiger counters placed above and below the chamber. The change over from one mode of operation to the other is very simple.

ISSN:0034-6748    

DOI:10.1063/1.1752323

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

A six‐stage oil diffusion pump is described, using ordinary lubricating oil which is fractionally distilled in the pump so that a vacuum of 10−6mm can be obtained without the use of vapor traps.

ISSN:0034-6748    

DOI:10.1063/1.1752324

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752325

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

An electronic device for the detection of bridge balance is described herein. It employs no meters but instead uses a visual indicator tube. The circuit is so arranged that the sector moves only when the bridge is near balance; thus high sensitivity is attained with the small scale available with these tubes. A second tube is used to establish approximate balance and provision is also made for neutralizing small residual signals. In this way minimum points may be determined with a high order of precision.

ISSN:0034-6748    

DOI:10.1063/1.1752326

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

Vacuum seals machined from metals and adapted to vacuum technique are described and shown in several forms suitable for joining metal and glass components. Precautions in construction and use are given. Dimensioned working drawings for several sizes of one type are shown.

ISSN:0034-6748    

DOI:10.1063/1.1752327

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

A versatile Wheatstone bridge is described for alternating current impedance measurements at frequencies from 30 to 10,000,000 cycles. Variable electrolytic resistors have proven very satisfactory both for balancing the bridge and as secondary standards of resistance. A selector switch in each working arm permits any one of nine different combinations of impedances to be connected in the arm so that it is possible to make either direct or substitution measurements against either wire wound or electrolytic resistors. Substitution measurements are made with an electrolytic resistor over the frequency range in 20 minutes, with an impedance accuracy of 0.2 percent. The equipment was designed and has been used primarily for impedance measurements of biological materials.

ISSN:0034-6748    

DOI:10.1063/1.1752328

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

There is described a device for the production of rectangular current pulses of variable strength and duration, which does not require the use of mechanical timing accessories.

ISSN:0034-6748    

DOI:10.1063/1.1752329

出版商:AIP    

年代:1937

数据来源: AIP