Engineering:Electromagnetic oscillograph
From HandWiki
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.[1]
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
- ↑ (in en) Scientific Bulletin. 11. The Office. 1986. pp. 104. https://books.google.com/books?id=4Y7q09PK7mUC.
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