Table of chords of arcs, 0t̊o 60,̊ to facilitate the projection of angles.
|Corporate Author:||Great Britain.|
London, Printed for the Hydrographic Department, Admiralty, by Eyre and Spottiswoode, Ltd, 1913.
Rev. and rearranged in the Chart branch of the Hydrographic department, Admiralty, 1913.
H. 140. Rev. December, 1913.
 p. incl. tables.
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