United States. Army. Signal Corps · Washington · leaf 112
f a circular disk which is mounted on a pivot attached to the bottom of the bowl. This disk contains two magnets, and it is prevented from lifting off the pivot by a wire attached to the side of the bowl. Fixed into the disk are two wires at right angles which carry on their ends a ring on which… … Fig. 43. This compass has short and weak magnets so that the card has a long period of oscillation. The card of this compass is little affected when the airplane turns. C. The Creigh Osborne compass. — This compass consists of a spheri- cal bowl which has a window similar to that mentioned above.…
Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
