Signedunsigned
InscribedPaper label: Wm. BOND / small / metal parts / from R. Mills / June 1969
FunctionBefore sand casting an instrument part from brass or other metal, a foundry pattern is made from wood or metal. The pattern is a replica of the part to be cast,. The pattern is pressed into sand, creating a cavity into which the molten metal will be poured.
Historical AttributesThese foundry patterns came from the workshop of William Bond & Son. Some of the patterns are associated with astronomical regulators and instruments used at the Harvard College Observatory. These instrument are currently in the Harvard Collection of Historical Scientific Instruments.
Provenancefrom R. Mills, June 1969