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| APIANUS, Petrus
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Instrument Buch
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Ingolstadt 1533
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First edition
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Folio, 32cm
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Contemporary blindstamped pigskin, remains of ties
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A sammelband with two other contemporary works
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This is the first general treatise on measuring instruments for astronomy and surveying. The figure below illustrates a solar quadrant, used to tell time by sighting the altitude of the sun and then reading the time of day from the appropriate scale. Each quadrant would have been designed and calibrated for a particular angle of latitude.
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a solar quadrant, from Apianus, Instrument Buch, Ingolstadt 1533.
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