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Mar 1931

Volume 2, Issue 3, pp. 153-210


A NEW X‐RAY SPECTROGRAPH FOR WAVE‐LENGTH DETERMINATIONS IN AIR

S. Zeidenfeld

Rev. Sci. Instrum. 2, 153 (1931); http://dx.doi.org/10.1063/1.1748769 (11 pages)

Online Publication Date: 17 December 2004

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See Also: Erratum

Abstract Unavailable

A PERIODIC CONTACTOR OPERATED BY A NEON‐TUBE OSCILLATOR

Herbert J. Reich

Rev. Sci. Instrum. 2, 164 (1931); http://dx.doi.org/10.1063/1.1748770 (7 pages) | Cited 1 time

Online Publication Date: 17 December 2004

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Abstract Unavailable

AN AUTOMATIC CONSTANT LEVEL DEVICE FOR LIQUID AIR

R. B. Scott and F. G. Brickwedde

Rev. Sci. Instrum. 2, 171 (1931); http://dx.doi.org/10.1063/1.1748771 (2 pages) | Cited 9 times

Online Publication Date: 17 December 2004

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An apparatus is described which will automatically maintain a constant level in a bath of liquid air.

POSITIVE ION EMISSION FROM THIN PLATINUM FILMS ON GLASS

R. A. Nelson

Rev. Sci. Instrum. 2, 173 (1931); http://dx.doi.org/10.1063/1.1748772 (7 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

MEASUREMENTS OF TEMPERATURE COEFFICIENT AND PRESSURE COEFFICIENT OF QUARTZ CRYSTAL OSCILLATORS

S. Leroy Brown and Sidon Harris

Rev. Sci. Instrum. 2, 180 (1931); http://dx.doi.org/10.1063/1.1748773 (4 pages)

Online Publication Date: 17 December 2004

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A method of measurement is used whereby variation in frequency of a high frequency oscillator can be measured easily to a fraction of a part in a million. The audible difference tone produced by a harmonic of a constant, high frequency oscillator and a harmonic of a second oscillator is compared to the tone of a variable, calibrated audio frequency oscillator. Any change of the frequency of the second high frequency oscillator is measured to a fraction of a cycle per second. This method of measurement is used to determine the effects of temperature and pressure on the frequency of a piezo‐electric oscillator. The temperature effect is of the order of 20 parts per million per degree centigrade while the pressure effect is of the order of only 6 parts per million per atmosphere.

THEORY OF A COMBINED SERIES AND POTENTIOMETER RHEOSTAT

J. Rud Nielsen

Rev. Sci. Instrum. 2, 184 (1931); http://dx.doi.org/10.1063/1.1748774 (3 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

A THERMOSTAT REGULATOR

Elliot Q. Adams

Rev. Sci. Instrum. 2, 187 (1931); http://dx.doi.org/10.1063/1.1748775 (2 pages)

Online Publication Date: 17 December 2004

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A thermostat regulator has been constructed with a tungsten‐mercury contact in hydrogen permanently enclosed in glass. Adjustment is made by a mercury‐tight tungsten plunger in another 2 mm capillary, one complete turn of the micrometer head advancing the plunger approximately 1 mm, equivalent to 0.08°C. The contact breaks approximately 1 milliampere which actuates relays controlling the heating circuit of one ampere, 110 volts ac. The regulator kept a 50‐liter water thermostat constant to ±0.002°C, for an hour, with a 5‐minute regulation cycle. With an auxilary heater close to the regulator, the temperature variation was less than ±0.001°C over a period of three hours and the regulation cycle less than 1 minute.

AN APPARATUS FOR THE EVAPORATION OF VARIOUS MATERIALS IN HIGH VACUA

C. Hawley Cartwright and John Strong

Rev. Sci. Instrum. 2, 189 (1931); http://dx.doi.org/10.1063/1.1748776 (5 pages) | Cited 13 times

Online Publication Date: 17 December 2004

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Abstract Unavailable

A STRIKING VARIATION OF THE TREVELYAN ROCKER EXPERIMENT, USING ``DRY ICE''

C. F. Hagenow

Rev. Sci. Instrum. 2, 194 (1931); http://dx.doi.org/10.1063/1.1748777 (1 page)

Online Publication Date: 17 December 2004

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Abstract Unavailable

THE USE OF FILTERS WITH PHOTOELECTRIC TUBES

Lewis R. Koller

Rev. Sci. Instrum. 2, 195 (1931); http://dx.doi.org/10.1063/1.1748778 (4 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable

ABSTRACTS OF ARTICLES RELATING TO NEW INSTRUMENTS AND METHODS

Rev. Sci. Instrum. 2, 200 (1931); http://dx.doi.org/10.1063/1.1748779 (11 pages)

Online Publication Date: 17 December 2004

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Abstract Unavailable
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