Spiral slide rule "R.H.S. Calculator" made by Steward

Spiral slide rule "R.H.S. Calculator" made by Steward, with descriptive booklet; size of rule 11 1/2" long by about 7/8" diameter, metal, with paper scale

Details

Category:
Mathematics
Object Number:
1922-92
type:
spiral slide rule
credit:
Lt. James F. Godwin