Signedface, top center: STANLEY LONDON
Inscribedface, top right: MADE IN ENGLAND;
etched into surface of face, center: BUS
FunctionPrimarily for measuring angles. As Stanley himself pointed out, "The scales are of very little use for practical purposes, as they are too short, and do not read to the edge." (William Ford Stanley, A Descriptive Treatise on Mathematical Drawing Instruments (London: E. & F.N. Spon, 1878), 235.)
Primary SourcesStanley, William Ford. A Descriptive Treatise on Mathematical Drawing Instruments. London: E. & F.N. Spon, 1878.
ProvenancePrivate Donor, Troy, New York.