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Radcliffe Tracts 46 (31)Martin, Benjamin
An Explanation of a new Construction and Improvement of the Sea Octant and Sextant, containing a most easy, expeditious and accurate Method of Adjusting and Rectifying those Instruments for Use both at Sea and Land. Also the best Disposition of the Glasses; with Directions for making the Fore and Back Observations; and the several Steps in the Process of finding the Longitude at Sea
London: Printed for the Author, at no. 171, Fleet Street, n.d.
[1934-41]
[n.d.]