Details
A mahogany-framed marine slide rule,
inscribed Brown's Slide Rule for Engineers, for calculating coal consumption, horse power, speed and other appropriate calculations -- 16¾in. (42.5cm.) long; and five cable samples
inscribed Brown's Slide Rule for Engineers, for calculating coal consumption, horse power, speed and other appropriate calculations -- 16¾in. (42.5cm.) long; and five cable samples