Abstract
The following experimental formulas about the damping curve were obtained by our last experiments of magnetic compass bowl, which was reported on Journal No.9. [numerical formula] [numerical formula] Calculation error is contained about 5% in t_i and 10% in P_i, when the card constant (Cn=(d^4/M)^<2/3>) is 10±5 or the simplest card contant (Cn=d^<3/8>/M) instead of Cn is 1±0.5. When the inner part of the card was hollowed out and the clearance has been made bdtween the float and the card, about mentioned formula must be corrected by the following expression. T'=T-kT'(D^3-D^3_0) t'_1=t_1-kt'_1(D^3-D^3_0) P'_1=P_1-kP'_1(D^3-D^3_0) The error caused by this calculation does not exceed 5%, except the breadth of the card is narrower than 1 centimeter. This formula will be used conveniently for the designer of magnetic compass.
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