“A Vitious Way of Observing”: Kinnebrook and the Prehistory of the Personal Equation | Isis: Vol 116, No 3

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Christopher Green

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Aug 13, 2025, 10:07:18 AMAug 13
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Fellow Historians of Psychology,

As you will recall, E. G. Boring related the familiar story of the British Astronomer Royal, Nevil Maskelyne, firing his assistant, "Kinnebrook," for reporting star transit times that were consistently slower than his own. And later, the Swiss astronomer, Friedrich Bessel, took this dispute as the basis of the "personal equation," which Boring took to be one of the first quantifiable problems of psychology, leading to a whole industry in early reaction time studies. 

Boring relied entirely on Maskelyne's report of the dispute. David Kinnebrook's account of the matter was not available to Boring, nor to the other history of psychology textbook writers who have repeated it. Kinnebrook's account did not re-emerge until 1985. The latest issue of the journal Isis, however, has published an article that provides the fullest account yet of the matter. The abstract is here:
https://www.journals.uchicago.edu/doi/abs/10.1086/736892
You can probably pull the full article from your own library's digital collections.

Best,
Chris
...........................................
Christopher Green
Professor Emeritus 
Department of Psychology
York University
Toronto, ON M3J 1P3
Canada


Harry Heft

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Aug 13, 2025, 10:23:34 AMAug 13
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Thanks Chris!   Harry

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Harry Heft
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