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ABSTRACT THIS book provides an interesting and sound introduction to the subject of finding one's way in the air. In many ways the investigation of methods of air navigation is based on
nautical experience, but the author points out that the reverse process is beginning to apply. The chief differences appear to arise from the greater speed of aircraft as compared with the
steamship, and the considerable altitudes above sea-level reached by the aeroplane and airship. Height in itself gives a wider range of vision, and in clear weather allows a greater
jpermissible error in dead-reckoning without loss of port than is required for a ship seeking harbour. These points are clearly brought out in the little book under notice, and the various
steps involved, both of observation and calculation, are developed simply. Whilst non-mathematical in character, we suggest that “Air Navigation” would provide a suitable starting-point for
the more complex studies of advanced works and, what is perhaps more important in the present state of aeronautics, encourage capable students to extend the subject into regions yet
unexplored. The main ideas of navigation are illustrated by examples from the great flights of the post-war period—Atlantic and Australasian. The correction for wind for aircraft is more
important than that for tide and steamship, and clouds interfere with surface observations to an undesirable extent. Such difficulties, at any rate near land, will be countered by the use of
direction-finding wireless telegraphy, a subject dealt with in one of the chapters of the book, which may be recommended as covering the essentials of present-day knowledge. A Primer of Air
Navigation H. E. Wimperis By. Pp. xiv + 128. (London: Constable and Co., Ltd., 1920.) Price 8_s_. 6_d_. net. Access through your institution Buy or subscribe This is a preview of
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CITE THIS ARTICLE _A Primer of Air Navigation_ . _Nature_ 106, 240 (1920). https://doi.org/10.1038/106240b0 Download citation * Issue Date: 21 October 1920 * DOI:
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