Bubble sextant manual

It takes its name from an air bubble in a liquid-filled chamber that functions like a carpenter’s level, indicating when the sextant is aligned horizontally. When I look through the eyepiece of my sextant, I locate a star and, with a drum on the side of the instrument (like a camera’s focus ring), adjust the angle of a rotatable prism until the star showing in the eyepiece is aligned beside the bubble. Ref: Operation, Service and Overhaul Instructions for Aircraft Sextants Types A-6, A-6A, A-8 and A-8A (Bausch Lomb) (Army Air Corps, 25 August , revised 23 January ); the original restrictions on this publication were lifted after the war. Bausch Lomb at War (ca. ), p. Tilt the sextant slightly to the right and forwards so that the bubble appears about 10 o'clock in the field of view, and gradually ease back the control knob until the bubble has nearly disappeared; then tilt the sextant to the left to bring the bubble apparently about 2 or 3 o'clock, and finish releasing the tension, but do this slowly.

The bubble assembly, which IS readily ranovable from the Sextant housing, consists of a main brass housing which is machined to take the component parts or the bubble assembly and the pos- itioning plate. The bottom of the bubble chamber Is a clear lens, ground and polished optically flat and parallel. This lens is held. Tilt the sextant slightly to the right and forwards so that the bubble appears about 10 o'clock in the field of view, and gradually ease back the control knob until the bubble has nearly disappeared; then tilt the sextant to the left to bring the bubble apparently about 2 or 3 o'clock, and finish releasing the tension, but do this slowly. Rotate the bubble control knob by moving the thumb downwards and look Z through the eyepiece in a horizontal direction until a bubble appears in the field of view. This will probably be too large. Tilt the sextant slightly to the right and forwards so that the bubble appears about 10 o’clock in the field of view, and.

Bubble sextant Type AN with altitude averaging device for use on aircraft. Made by Bendix Aviation Corporation. Teterboro, New Jersey USA. Instructions. The left half of the sextant carries the bubble and its collimating coincidence with the bubble to the best of his ability. INSTRUCTIONS FOR USE. FS Simulated Aircraft Bubble Sextant. Can be used with any FS aircraft. Includes comprehensive browser-based manual and references.