NDLI: Electrical Measurement of Physical Values The Determination by Electrical and Magnetic Means of Quantities not in Themselves of an Electrical Nature

Content Provider	IEEE Xplore Digital Library
Author	Borden, Perry A.
Copyright Year	1884
Abstract	This paper was prepared under instructions from the Committee on Instruments and Measurements, with a view to forming a basis for the Committee's work in connection with electrical measurements as applied outside of the strictly electrical field. The system of classification used is in accordance with the nature of the quantity under measurement, rather than with the principle involved; and the subject is treated under nine headings. Measurement of Temperature: There are recognized two principal methods of electrically measuring temperature; the thermoelectric circuit, and the effect of temperature upon the resistance of many conducting materials. Outlines are given of the elementary applications of these, and a number of practical instrutments embodying one or the other of the principles are described. Reference is made to several types of calorimeters embodying electrical methods of temperature measurement, and to hygrometers or humidity meters, in which the principle of the thermocouple has been applied. A brief description is also given of the optical pyrometer. Measurement of Stress, Strain or Small Changes in Physical Dimensions: General reference is made to the changes which take place in both the electrical and magnetic characteristics of materials when exposed to mechanical stresses, with particular attention given to resistance effects. Several applications of the carbon pile in strain determination are mentioned. Recent developments in the use of the piezo-electric effect of certain crystals are described; and the use of the thermionic tube and its associated circuits for measuring very small dimensional changes is briefly treated.
Starting Page	238
Ending Page	263
Page Count	26
File Size	8899075
File Format	PDF
ISSN	00963860
Volume Number	XLIV
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1925-01-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric variables measurement Magnetic field measurement Electrical resistance measurement Temperature measurement Circuits Electric resistance Strain measurement Magnetic field induced strain Magnetic materials Instruments
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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