By Topic

Review of Scientific Instruments

Issue 5 • Date May 1934

Filter Results

Displaying Results 1 - 9 of 9
  • Issue Table of Contents

    Page(s): toc1
    Save to Project icon | PDF file iconPDF (186 KB)  
    Freely Available from IEEE
  • Recording and Reproducing Sound

    Page(s): 177 - 182
    Save to Project icon | PDF file iconPDF (482 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Refracting Interferometer for Examining Modes of Vibration in Quartz Plates

    Page(s): 183 - 186
    Save to Project icon | PDF file iconPDF (314 KB)  

    A more sensitive method for observing longitudinal modes in vibrating piezoelectric plates consists in measuring the changes in the optical path presented by these plates to a beam of light. This is simply and conveniently accomplished by placing the transparent piezoelectric plate in one arm of a Michelson interferometer so that one of the interfering beams passes through the plate. Where a Michelson interferometer is not available, this may be accomplished in the case of a thin plate by means of the thick‐film fringes formed by reflecting a beam of light from the two major surfaces of the plate. Changes in the optical path are dominated by the changes in the index of refraction of the vibrating plate. The variations of the index of refraction are markedly greater for the extraordinary ray of a light beam propagated along the Y‐axis of a Y‐cut quartz plate in which the compressional wave trains are propagated along the X‐axis. Preliminary observations regarding the variation of the index of refraction in other crystal cuts are also presented. A brief summary is given of the longitudinal modes which have been observed in plates of quartz and tourmaline. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Apparatus and Technique for Growing Large Specimens of Single Crystal Zinc

    Page(s): 187 - 190
    Save to Project icon | PDF file iconPDF (292 KB)  

    The apparatus and technique are described for the growth of large, strain‐free, single crystals of zinc of any desired orientation. It is shown that a gross mosaic structure may occur in the beginning of the growth of a crystal but may be eliminated by a steep temperature gradient. The data show the necessity of satisfying certain growth conditions, namely, that the ratio of the temperature gradient to the rate of growth must be near a certain favorable, but not necessarily the same, value for each orientation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Maintenance of an Independent Reed

    Page(s): 192 - 193
    Save to Project icon | PDF file iconPDF (136 KB)  

    During the vibration of a free reed the flow of the maintaining wind is more rapid on the low pressure side of the tongue, and consequently the reduction of pressure on that side is the greater. The inertia of the air causes the resulting pressure difference to have a component in phase with the velocity of the tongue, thus making maintenance possible. A similar explanation is given for the maintenance of Rayleigh's ``tuning fork siren.'' View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Cell for Routine Electrical Measurements on Insulating Oils

    Page(s): 194 - 196
    Save to Project icon | PDF file iconPDF (217 KB)  

    The requirements to be met by a cell for routine determinations of the resistivity of insulating oils are given. A guard‐ring cell meeting these requirements is described, and its application to power factor measurements discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Measurement of Small Alternating Voltages at Audiofrequencies

    Page(s): 196 - 200
    Save to Project icon | PDF file iconPDF (320 KB)  

    The origin of noise in vacuum tube amplifiers is discussed. An amplifier is described which can be used for the measurement of low voltages. A type 38 tube operated below ionizing voltages of the gas in the tube is found to have a low noise level. 10-8 volt can be measured in the audiofrequency range. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • PHYSICS NEWS

    Page(s): 203 - 204
    Save to Project icon | PDF file iconPDF (134 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

Review of Scientific Instruments, published by the American Institute of Physics, is devoted to scientific instruments, apparatus, and techniques.

Full Aims & Scope

Meet Our Editors

Editor
Albert T. Macrander
Argonne National Laboratory