
3 4 c m
40cm
actual image size: 32cm x 26cm
Description
This instrument was designed primarily to ensure that a cannon or mortar was elevated to the required angle. Quadrants were also used for navigational purposes to determine the altitude between some heavenly body and the horizon. George Adams (1750-1795), was instrument maker to George III, as his father was before him.
Image Details
Image Ref.
10328259
© Science Museum / Science & Society Picture Library