Spiral slide rule "R.H.S. Calculator" made by Steward
- Made:
- London
- maker:
- J H Steward Limited
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
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
