An electromagnetic oscillograph is an
oscillograph which measures variations of electric current by having it go through a magnetic coil. Variations in current induce momentum in the coil, which can be directly measured.
The electromagnetic oscillograph was invented by
William Duddell
William Du Bois Duddell (1 July 1872, in Kensington, London – 4 November 1917, in Wandsworth, London) was an English physicist and electrical engineer. His inventions include the moving coil oscillograph, as well as the ammeter, thermo-ammete ...
.
Some models utilise a mirror which reflects a beam of light, allowing measurement of minute movements of the coil. Other were fitted with a hand, possibly fitted with a pen to record values.
References
External links
William du Bois Duddell
Measuring instruments
British inventions
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