Pocket sextant instructions

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full sized sextant owing to the very small instrument parallax. On the preceding two pages will be found instructions for using these tables. Buy Pocket bubble sextant: Instructions for use in finding latitude and longitude by Eckert, W. J (ISBN: ) from Amazon's Book Store. Also called a box sextant. This unique and unusual instrument comes with a wooden box. Sextants - Instructions on how to use a sextant© A fine example of a WW2 military pocket or box sextant, made by Francis Barker for T A Reynolds Son & Wardale, signed on the face 'T.A.R.S. & W. Ltd, B 876',Harvard Professor John Huth, who teaches a "Primitive Navigation" course, demonstrates how to use a Pocket Bubble Sextant Instructions for use in finding Longitude and Latitude. Repro ID: rw1430 Description, Pocket bubble sextant instruction booklet. A sextant is an instrument for measuring the altitude of a celestial body above the earth's horizon in terms of the included angle.