F1306

Ring dial Long Caption: Ring dial for latitude 51° North. The ring has a fixed suspension piece and a large suspension ring. The outer face displays a date scale, stamped with the initial letters of each month. It appears to be set with equinoxes at approximately 10 March and 10 September. On the inner face is a stamped hour scale numbered 4-12, 1-8. There is a sliding central collar with a pinhole sight set into it, which is adjusted by a buckle-type attachment on the collar. Credit line: © National Maritime Museum, Greenwich, London, Gabb Collection Object: AST0398 Artist: unknown Date: 17th century Medium: brass Size: 10 mm x 37 mm Click here to buy a bespoke print of this image.