Aeronautic Instruments. Section IV : Direction Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 49
oth in magnitude and duration. This makes possible a subsequent proportionate correction. DANISH AND SWISS COMPASSES. Following are descriptions of the Knudsen compass and the Stoppani double pivot in- verted compass. KNUDSEN COMPASS. The Knudsen compass (fig. 34) is a Danish instrument of the… … Fig. 34.—Knudsen compass. Fig. 35.—Stoppani double pivot inverted compass. a sapphire cup bearing on its lower surface. The pivot is supported on a spider near the bottom of the bowl. It consists of an alloy point set in a short brass rod. The bowl is cylindrical, 106 millimeters in diameter and 60…
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