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Title: Spiral slide rule "R.H.S. Calculator" made by Steward, with [Go to resource]
Description: 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 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: spiral slide rule Source: Science Museum Creator: J.H. Steward Limited Identifier: 1922-92 Go to resource More Like this...
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