Electromagnetic oscillograph
- Electromagnetic oscillograph
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.
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.
External links
* [http://www.yokogawa.com/rd/MM/rd-mm-collection-03-en.htm Yokogawa and the Electromagnetic Oscillograph]
* [http://chem.ch.huji.ac.il/history/duddell.html William du Bois Duddell]
* [http://www.freepatentsonline.com/2466691.html Electromagnetic oscillograph]
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