Overall: 22 1/2 x 15 x 2 1/2 in. ( 57.2 x 38.1 x 6.4 cm )
Steel calipers with two curved, tapered jaws connected to two steel bolts and brass wingnuts.
Gift of Dr. Frederick Griffith
stamped: on side of caliper: "DAVID R. GRIFFITH/Philadelphia"
stamped: on obverse of other caliper: "David R. Griffith"
Due to ongoing research, information about this object is subject to change.