C. H. Cotter

Peer Reviewed

Abstract: Investigation of original letters and papers, preserved in the archives of the Royal Society of London, pertaining to the respective inventions of John Hadley and Thomas Godfrey, reveals that no grounds exist for assuming that either plagiarized the inventions of the other. Each of the two instruments designed by Godfrey is of an entirely different design from that of Hadley’s quadrant. Although it was Hadley’s quadrant that was generally adopted by seamen - and, indeed, it formed the basis of the modern sextant - both Godfrey and Hadley are to be credited for their novel inventions.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 25, Number 1
Pages: 28 - 33
Cite this article: Cotter, C. H., "THOMAS GODFREY'S QUADRANTS", NAVIGATION: Journal of The Institute of Navigation, Vol. 25, No. 1, Spring 1978, pp. 28-33.
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