Metal position slide rule

Slide rule.
Metal position line slide rule
Diam. 2.8" (7.1 cm)
Four slide rules for calculating altitude.
Cylindrical and three tubes. Log cotangent and log cosine scales.
In metal cases

Object Details

ID: NAV0195
Type: Slide rule
Display location: Not on display
Creator: Dennert & Pape
Date made: circa 1939
Credit: National Maritime Museum, Greenwich, London
Measurements: Diameter: 63 mm;Overall: 282 mm
Parts: Metal position slide rule