| 摘要 |
<p>PURPOSE:To improve the detecting accuracy of displacement in a month an a planimeter or the like. CONSTITUTION:The surface of a magnetic ball 1' is divided into eight sections of a solid triangle at a solid angle of 90 deg. with two points in the diametral direction as the center, and each of eight poles 2A, 2B, 3A, 3B, 4A, 4B, 5A and 5B, where a magnetic field of N pole or S pole is generated, is made contact with respective sections under pressure. The magnetic field of N or S pole is generated so as to each section comes to polarity different from an adjacent section, through which each section is magnetized to the N or S pole.</p> |
