Electrical Engineering Measuring Instruments for Commercial And Laboratory Purpo
Electrical Engineering Measuring Instruments for Commercial And Laboratory Purpo
George Dudley Aspinall Parr
The book Electrical Engineering Measuring Instruments for Commercial And Laboratory Purpo was written by author George Dudley Aspinall Parr Here you can read free online of Electrical Engineering Measuring Instruments for Commercial And Laboratory Purpo book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electrical Engineering Measuring Instruments for Commercial And Laboratory Purpo a good or bad book?
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201. These are carefully " aged " and magnetized so as to be strong and permanent. The pen, or inker, attached to the spindle and coil, rests against the paper with a small component of its own weight, sufficient to give a clear mark- ing without introducing a fric- tional error. The clock - work, which drives the drum once round either every twelve or twenty- four hours, has a non- mag- netic lever movement, and is free from back-lash a com- mon fault with clocks of this nature. It is attached... to the base of the instrument by a hinge, enabling it to be drawn outside the case when chang- ing the chart on its surface. When pushed back against a stop it is in its working posi- tion. The scale is an extremely open one at the working part, and is marked in one -volt divisions. Recording" Ammeters and Voltmeters Fig. 200. Kelvin Permanent- Magnet Moving-Coil Recording Voltmeter The instruments of this class, made by Messrs. Everett, Edgcumbe, & Co. , of London, for use with direct currents, are constructed on the well-known moving-coil D'Arsonval principle, which it is unnecessary to explain.
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