| 摘要 |
An attitude indicator having a circular, annular transparent tube containing a liquid, preferably colored, and a gas bubble, the tube being constructed for encircling and for being fastened non-rotatably upon the forearm, in a position perpendicular to the length of the forearm of a diver. The readily visible position of the bubble in the tube enables the diver to compare and determine instantly, at any moment, the angular attitude, with reference to gravitational lines of force, of the tube itself, the attitude of his forearm and body, and the angular attitudes of nearby structures and surfaces.
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