A two-piece socketed stone bearing; upper member slightly convex on under surface with boss in center which fits into socket in center of slightly concave upper surface of lower member. Contacting surfaces worn smooth, lower member has ledge of about 0.03. Gray stone roughly cut on outside. Possible 4-part division on lid, broken down on one side.
Height
14 cm
Outside Diameter
20 cm
Credit Line
Other Number
4224 - Original Number
Current & Past Exhibitions
This object has never been on display.
Bibliography
Singer, Charles J., and Eric J. Holmyard. A History of Technology. I. See: p. 201
