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Galileo's military compass, 17th century

Galileo's military compass, 17th century

C026/8917

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Credit

LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY

Caption

Galileo's military compass. Italian mathematician, engineer, physicist and astronomer Galileo Galilei (1564-1642). Also known as a proportional compass or a sector, this instrument is used for trigonometry, surveying, navigation and aiming artillery such as cannon. It consists of two rulers of equal length joined by a hinge. When opened, a curved quadrant (upper right) enables it to be used as a quadrant. This page of illustrations is from Galileo's 'Le operazioni del compasso geometrico, et militare di Galileo Galilei' (Padua, 1606). The publishing location and name of the printer are at upper left.

Release details

Model release not required. Property release not required.

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