This paper is described to be measured the concomitant angle in the artificial magnetic field in order to estimate the characteristic of movement and the performance of the magnetic compasses made in Korea. The results obtained are summarized as follows: 1. The overdevelopment of the concomitant angle of A and B compass are increased the declination between maximum and minimum at 180$^{circ}$ period, but C and D compass are kept regularly within 1$^{circ}$~2$^{circ}$ at 90$^{circ}$ period. 2. The concomitant angle in accordance with the horizontal magnetic force of C compass is comparatively smaller than the other ones, and when the horizontal magnetic field is below 0.18 gauss its compass can be found unsuitable at high latitude sea because the concomitant angle is large. 3. When the coefficient of viscosity of the compass liquid is 0.027 poise, the concomitant angle of the experimented all compass is revealed to small.