Details
Two Fowler's calculators:
the first with double dials, instructions and spare dials, in nickelled case -- 2½in.(6.5cm.)diam., the second in leather pouch -- 3¼in.(8.5cm.)diam. (2)
the first with double dials, instructions and spare dials, in nickelled case -- 2½in.(6.5cm.)diam., the second in leather pouch -- 3¼in.(8.5cm.)diam. (2)