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Simple Graphical Solutions of Spherical Triangles

Published online by Cambridge University Press:  23 November 2009

Charles H. Cotter
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Extract

A Device known as the Simplified Astro Platten (S.A.P.) is presently being marketed by the Bucks. Gear and Engineering Co. Ltd., of Middle Lane, Mount Pleasant, Aylesbury. It consists of a large rectangular plastic sheet some 29 in. by 16 in. on which are engraved two graduated semicircles with parallel diameters separated by a space of 2 inches. This sheet, on which pencil lines may be drawn and which can easily be cleaned when the lines are no longer required, is housed in a stiff plastic protective envelope. A mimeographed booklet of instructions includes examples and answers, for practice. There is no indication of the principles on which the device is based but the idea is certainly not new.

Type
Research Article
Information
The Journal of Navigation , Volume 28 , Issue 3 , July 1975 , pp. 306 - 312
Copyright
Copyright © The Royal Institute of Navigation 1975

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References

REFERENCES

1Kitchin, F. A. L. (1898). Practical solution of a spherical triangle. The Nautical Magazine, Glasgow, 67, 344.Google Scholar
2Kitchin, F. A. L. (1896). An altitude azimuth diagram. The Nautical Magazine, Glasgow, 65, 337.Google Scholar
3Robinson, T. Wood. (1897). Protraction as applied to spherical trigonometry. The Nautical Magazine, Glasgow, 66, 48.Google Scholar