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Note on Napier's Rules

Published online by Cambridge University Press:  20 January 2009

John Jack
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Now a third Δ can similarly be derived from this second, a fourth from the third, and a fifth from the fourth. But when the process is applied to the fifth, the first Δ is obtained. Hence only 5 Δs can be obtained, which are the following:-

where the mid-column contains the hypotenuse, the two next to it contain the angles, and the extreme columns the sides of the several right-angled triangles.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 16 , February 1897 , pp. 40 - 41
Copyright
Copyright © Edinburgh Mathematical Society 1897