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Originalmente publicado por armensis
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THE A-l0-A SEXTANT
The type A-10-A aircraft sextant is a precision instrument designed for use in aerial navigation. With this instrument, the angular altitude of a celestial body can be measured and recorded with reference to a bubble artificial horizon. This sextant is an indirect sighting instrument. This means that by looking in a horizontal direction and turning a prism geared to an altitude scale, it is possible to bring a celestial body into the field of view. With the body in collimation, the altitude is read from the altitude window. The A-10-A has an automatic marking device which is operated by a solenoid timing mechanism, which makes a mark on a plastic disk. This is a visual averaging mechanism. It is necessary to use the battery case at all times since it furrnishes power for the solenoid mechanism as well as bubble illumination. However, if the mechannism is inoperative, the marker may be operated manually without the use of the battery case and batteries.
