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U (Stack)Leybourn, William
The Description of an Entertaining and Useful Instrument, called Gunter's Quadrant: By which is performed Most Propositions in Astronomy; as the Altitude, Azimuth, Right Ascension and Declination of the Sun, etc. also his Rising and Setting; together with the Hour of the Day or Night, and other Conclusions, exemplified at large. To which is added The Use of the Universal Ring-Dial
Fourth edition. London: for John Gilbert, Mathematical, Optical, and Philosophical, Instrument-Maker, 1771.
[1981-26]
1771