416 of 520
Sorted by:
Instrument type

16th century; Italian
Brass; 80 mm in diameter

The instrument comprises a circle hollowed with one solid quadrant. The limb of the circle is engraved with a scale of hours, divided to 1/2 and 1/4 hour, numbered from 1 to 12 twice and from 1 to 24. The inner part of the circle has a quadrant with the other two radiuses connecting the centre to the circle, sliding in a groove inside the circle itself. The quadrant is engraved on a straight edge with a scale divided to 1/2, numbered from 1 to 9 and on the limb with an equal scale from 1 to 12 divided to 1/4, numbered from 1 to 12. On the quadrant are lines extending from the straight edge. A radial arm is fixed to the centre of the protractor, and is engraved with the same scale as in the square edge of the inner quadrant, numbered from 1 to 12. The back of the instrument is blank.

Ilaria Meliconi

Istituto e Museo di Storia della Scienza, Firenze
Inventory no. 2526

© Istituto e Museo di Storia della Scienza, Firenze. All rights reserved. Information and images provided here may not be reproduced in any form or by any means without the prior written permission of the museum.

Basic URL:

|| Introduction || Essay || Museums || Bibliography || Conventions || Credits || Privacy || Help ||
|Catalogue entries |Handlist || Makers || Places || Articles || Glossary || Search || Home ||