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Principes et Formules de Trigonométrie Rectiligne et Sphérique Par J. Pionchon. (Gauthier Villars.) 5 francs.

Published online by Cambridge University Press:  03 November 2016

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Type
Reviews
Information
The Mathematical Gazette , Volume 4 , Issue 71 , May 1908 , pp. 268 - 269
Copyright
Copyright © Mathematical Association 1908

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References

page 269 note * D’Ocagne’s abacus is of course simply the rectangular network that would be constructed as in Daniell’s Text Book of the Principles of Physics, pp. 80, 83, 84, for describing a series of ellipse traced by a point having two single harmonic motions at right angles to each other. In graduating the scales of cosines the origin is marked 90° in both cases, the number from 0° to 180° proceeding in the negative direction along each axis.