Details
A Fowler's Long Scale Calculator, 'Magnum',
with single face rotating dial in nickelled casing -- 4¾in. (12cm.) diam., in leather wallet; a celluloid and wood slide-rule, in slip-case, with two books of instruction; and an Allbrit planimeter in black bakelite case, with instructions (5)
with single face rotating dial in nickelled casing -- 4¾in. (12cm.) diam., in leather wallet; a celluloid and wood slide-rule, in slip-case, with two books of instruction; and an Allbrit planimeter in black bakelite case, with instructions (5)