General view of electromagnet form of Duddell moving-coil oscillograph, showing the oil bath, and electromagnet.
This instrument is specially designed to have a very high natural period of vibration (about 1 / 10,000 of a second) so as to be suitable for accurate research work. It is quite accurate for frequencies up to 300 Hz.
In the figure:
A is the brass oil bath in which two vibrators are fixed
B, core of electromagnet which is excited by two coils
C, one of the two coils
D, two pairs of terminals for connecting the two coils
E, bolts that hold the oil bath in position between the poles of the magnet
F, two of three leveling screens (one is hidden behind the oil bath)
G, terminals of one vibrator
H, fuse
K, thermometer with bulb in center of oil bath
Public Domain Source
Hawkins Electrical Guide, Volume 6
Chapter 63: Wave Form Measurement
Page 1858, Figure 2607
Copyright 1917 by Theo. Audel & Co.
Printed in the United States
Upload Notes
Scanned by User:DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com
Scanned at 600dpi, 8-bit grayscale
Level-adjusted and cleaned up
See Also
For a list of all these illustrations used in Wikipedia please see the article Hawkins Electric Guide on the English Wikipedia.
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=== Illustration Description === Figure 2607 -- Duddell Moving Coil Oscilliograph General view of electromagnet form of Duddell moving-coil oscillograph, showing the oil bath, and electromagnet. This instrument is specially designed to have a very high