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Notes and Reflections on Books and Media

by Hannah Leitheiser

O-Scope

The Science - History of the Universe Vol. 3: Physics & Electricity

Francis ROLT-WHEELER

1909

Link

2017-02-26

This is a device called a Koenig's manometric flame apparatus, which uses a flame to visualize a sound wave -- a 19th century o-scope. I'm guessing this is what Maxwell was talking about in his "To the Chief Musician upon Nabla."