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Jun 1940

Volume 11, Issue 6, pp. 183-206

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A Condenser Type High Speed Engine Indicator

Louis C. Roess

Rev. Sci. Instrum. 11, 183 (1940); http://dx.doi.org/10.1063/1.1751677 (13 pages) | Cited 7 times

Online Publication Date: 27 December 2004

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The condenser type of pressure pick‐up for a high speed engine indicator has advantages of simplicity, ruggedness, and frequency response over other types. As used ordinarily, with a d.c. polarizing voltage, fidelity at low frequencies requires the use of a very high impedance input circuit, with consequent troubles from poor stability, low sensitivity, and particularly ignition pick‐up. The latter has required the use of airplane type shielding on ignition systems. These difficulties have been completely overcome by use of a high frequency (several megacycles per second) ``polarizing voltage'' in conjunction with a special bridged T type of balancing circuit. The T elements of this circuit can be built into the pick‐up very simply and ruggedly, thereby eliminating difficulties with capacity changes in the lead wires. The sensitivity of the circuit is such that very little amplification is required. Frequency response is limited only by the elastic characteristics of the diaphragm. Both pressure‐time and rate of pressure change‐time cards can be observed and photographed. The wide frequency response of the indicator makes it particularly applicable to the study of knocking combustion.

Some Improvements in a Geiger‐Müller Counting System

Harold McMaster and M. L. Pool

Rev. Sci. Instrum. 11, 196 (1940); http://dx.doi.org/10.1063/1.1751678 (3 pages) | Cited 2 times

Online Publication Date: 27 December 2004

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A new method of interpolation is described which eliminates one tube per scale‐of‐two and does not disturb the equilibrium of the trigger tubes. A resolving time of 10−4 second was obtained with a quenching circuit incorporating the desirable features of both the Neher‐Harper and the multivibrator circuits.

On the Recording of Current Pulses by Slow Galvanometers

F. T. Rogers

Rev. Sci. Instrum. 11, 198 (1940); http://dx.doi.org/10.1063/1.1751679 (2 pages) | Cited 1 time

Online Publication Date: 27 December 2004

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Formulae are derived for the investigation of the lag between a current pulse through a galvanometer and the galvanometer's deflection. Examples are given, chiefly to galvanometric recording in microphotometry.

An Improved Technique for Mounting Powdered Samples for X‐Ray Diffraction

Joseph S. Lukesh

Rev. Sci. Instrum. 11, 200 (1940); http://dx.doi.org/10.1063/1.1751680 (2 pages) | Cited 5 times

Online Publication Date: 27 December 2004

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An Einthoven String Galvanometer‐Amplifier System for the Investigation of Photovoltaic Effects

W. Vanselow, G. P. Happ, John Russell, and S. E. Sheppard

Rev. Sci. Instrum. 11, 202 (1940); http://dx.doi.org/10.1063/1.1751681 (2 pages)

Online Publication Date: 27 December 2004

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A Convenient Electrical Micrometer

Ross Gunn

Rev. Sci. Instrum. 11, 204 (1940); http://dx.doi.org/10.1063/1.1751682 (1 page)

Online Publication Date: 27 December 2004

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An Inexpensive Stirrer for Large Water Baths

Allan Hemingway and Walter B. Shelley

Rev. Sci. Instrum. 11, 204 (1940); http://dx.doi.org/10.1063/1.1751683 (2 pages)

Online Publication Date: 27 December 2004

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Radioactive Standards

L. F. Curtiss, Clark Goodman, Alois F. Kovarik, S. C. Lind, C. S. Piggot, and Robley D. Evans

Rev. Sci. Instrum. 11, 205 (1940); http://dx.doi.org/10.1063/1.1751684 (1 page)

Online Publication Date: 27 December 2004

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Soldered Metal to Glass or Porcelain Seals

S. T. Martin

Rev. Sci. Instrum. 11, 205 (1940); http://dx.doi.org/10.1063/1.1751685 (2 pages)

Online Publication Date: 27 December 2004

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