The inscription on the inner side of the lower leaf is a little obscure but probably refers to the precision of the dial for all the latitudes where it can be used.

Museum of the History of Science, Oxford
Inventory number 70

© 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: http://www.mhs.ox.ac.uk/epact/catalogue.php?ENumber=71821