Signedon inner ring: Lucca 1764 / Gr. 43. 52'
FunctionThis is a portable sundial for finding the time.
The latitude is set by means of an index attached to the suspension shackle. The alidade is set for the date on the inner ring. To tell time, the dial and the inner ring are rotated until a spot of light from a pinhole falls on the hour ring.
ProvenanceDavid P. Wheatland, Topsfield, MA; gift to CHSI.