OH-Course alarm for navigators. - Steering monitor compass unit (Serial No.KH 74 754) together with control unit. (Serial No.1305) by Kelvin Hughes Ltd. OH-Course alarm for navigators
Circular slide rule for air navigation computations, plastic made by J.B. Carroll Company, Chicago Circular slide rule for air navigation computations
1. Compilation drawing; 2. Enamel zinc plate; 3. Lithographic zinc plate; 4. Printed chart. All for Admiralty Chart 1446, Aberdeen Harbour 1. Compilation drawing; 2. Enamel zinc plate; 3. Lithographic zinc plate; 4. Printed chart for Admiralty Chart 1446