ID:
645
Maker's Name:
W G PYE
Where made:
England
Dimensions:
9.5 × 8.5 × 9.5 cm
Tripod with central threaded leg and circular vernier scale. The spherometer measures the height difference between the tripod legs and the central leg. Knowing this height and the distances from tripod legs to central leg, a standard formula gives the radius of curvature (ROC) of the surface on which the spherometer stands.
