Letter Opener, Standard Steel Propeller Company Promotional Item 1920's (pre-Hamilton) C-46 the course correction is calculated

the course correction is calculated and communicated to the pilot

This instrument was used in aircraft with a navigator crewman as an aid to determine the position and course of the aircraft during nighttime flying using celestial navigation

The glass is loose and appears to need a new gasket

See photo of the location of the instrument on the Flight Engineers instrument panel from the C-121 flight manual dated 1958

Letter Opener, Standard Steel Propeller Company Promotional Item 1920's (pre-Hamilton) C-46 the course correction is calculatedHere is a beautifully presented chrome Letter Opener promotional item from the Standard Steel Propeller Company of Pittsburgh, PA. In 1929, Standard Steel Propeller merged with Hamilton Aero Manufacturing, thereafter known as Hamilton Standard. So our assumption is that this item was offered prior to 1929, since the decals on the letter opener state "Standard Steel Propeller" and not "Hamilton Standard" It is in exception condition. The decals are in