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It reads: A CONTINUOUS INTEGRAPH.* BY V. BUSH, F. D. GAGE, and H. R. STEWART. Electrical Engineering Department, Massachusetts Institute of Technology. ABSTRACT. A MECHANICAL integraph has been developed which plots continuously the integral of the product of two functions. It uses the principle of the electrical integrating watthour-meter combined with a moving table. Errors of the machine have been reduced to an average of 1 per cent. for common uses. By cross-connecting the device in a simple mechanical way, it is possible to solve certain types of integral equations. A link motion has been added which plots the product of two given functions. Various uses have been made of the instrument for solving problems in connection with electrical circuits, continuous beams, etc., and certain problems involving integral equations.

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It reads: A CONTINUOUS INTEGRAPH.* BY V. BUSH, F. D. GAGE, and H. R. STEWART. Electrical Engineering Department, Massachusetts Institute of Technology. ABSTRACT. A MECHANICAL integraph has been developed which plots continuously the integral of the product of two functions. It uses the principle of the electrical integrating watthour-meter combined with a moving table. Errors of the machine have been reduced to an average of 1 per cent. for common uses. By cross-connecting the device in a simple mechanical way, it is possible to solve certain types of integral equations. A link motion has been added which plots the product of two given functions. Various uses have been made of the instrument for solving problems in connection with electrical circuits, continuous beams, etc., and certain problems involving integral equations.
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Robert McNees (mcnees@mastodon.social)'s status on Saturday, 11-Mar-2023 21:34:12 UTC Robert McNees
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Bush and Hazen built their analog “differential analyzer” at MIT in the late 1920s.
The incorporated ideas from both Babbage and Kelvin (whose work was apparently not known to Bush) and could solve differential equations via integration.
https://www.sciencedirect.com/science/article/abs/pii/S0016003227900970?via%3Dihub

In conversation Saturday, 11-Mar-2023 21:34:12 UTC from mastodon.social permalink