Resistance coils for alternating current work

✍ Scribed by Curtis, H. L. (author);Grover, F. W. (author)

• Publisher: Elsevier Science
• Year: 1912
• Tongue: English
• Weight: 155 KB
• Volume: 173
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(12)90652-3

✦ Synopsis

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nometer, using it as a starti.ng point and making changes until proper constants are obtained. A regular procedure is developed f6r this purpose, starting with proper values of torque and weight, and taking into consideration the flux density in the air gap, length of air gap, number of turns on moving coil, size of coil, area and shape of pole pieces, etc. The total critical resistance should be from five to ten times the coil resistance, and the period should be short, I to I. 5 seconds. This calls for a rather high value of the flux in the air gap, from 1,5oo to 2,oo0.

General formulas are developed for the design of deflection potentiometers, and as a numerical example the complete design of the 1.5-volt instrument described in the previous paper is worked out in detail. P. 6. A.