Antique Drawing Instrument Collection - Spring Bow Set

This is a set of relative small spring bows, the length of the longest one of them is about three inches. There is no maker's mark on either the instruments or the case. However an illustration of an identical set can be found on p. 43 of A Descriptive Treatise On Mathematical Drawing Instruments by W. F. Stanley, therefore this set may be attributed to Stanley London and could be dated to mid nineteenth century.

Case Front View of the Case