World War II Astro Compass by W. W. Boes Co.

World War II Astro Compass MKII

W.W. Boes Co.

Dayton, Ohio

Aircraft operating in latitudes near to earth's magnetic poles find that their magnetic compasses are unreliable due to large errors in variation and the angle of dip of the earth's magnetic field. Enter the mechanical, nonmagnetic Astro Compass. When latitude, local hour angle and declination are set on the compass, and the sighting vanes are aligned with an identified celestial body, the true heading of the aircraft is indicated on the true course dial. In operation, the Astro Compass is attached to the aircraft structure by means of its base mount and then leveled using the transverse and longitudinal bubble assemblies.

The Astro Compass (also known as a "star compass") was designed in World War II for use in aircraft, but it is well suited in our modern world to align a boat's compass while away from shore-based magnetic interference. Moreover, it is useful to celestial navigators and amateur astronomers for identifying stars.

Presented is a fascinating, working example of the Astro Compass manufactured by W.W. Boes of Dayton, Ohio. It comes with its aluminum base mounting plate and a bakelite carrying case. These instruments are growing increasingly rare and are sought after by aircraft, nautical, military, and scientific
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