Folding horary quadrant

This is a folding horary quandrant made from northern Italian boxwood. It has scales for degrees, hours and signs of the zodiac. The folding format is very unusual. A plain box opens to reveal a square horary quadrant. This example shows Italian hours as well as common hours. A recess is provided for the storage of the plumb bob and enables the box to close.

Object Details

ID: ZBA0423
Collection: Astronomical and navigational instruments
Type: Folding horary quadrant
Display location: Display - ROG
Creator: Unknown
Date made: 1723
Credit: National Maritime Museum, Greenwich, London. Purchased with the assistance of Cecil Elsom, 1997.
Measurements: Overall: 9 x 127 x 99 mm