It finds the derivative: The Ott Derivimeter (1930s)
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from tedu to tech on 04 Jan 12:18
https://azorius.net/g/tech/p/37135DZtFttGBN3zkJ-It-finds-the-derivative-The-Ott-Derivimeter-1930
from tedu to tech on 04 Jan 12:18
https://azorius.net/g/tech/p/37135DZtFttGBN3zkJ-It-finds-the-derivative-The-Ott-Derivimeter-1930
The Ott Derivimeter, an instrument for finding the derivative of a curve drawn on paper. Sold by the Ott company in the early 20th century, though I don't know when mine was made.
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