| 摘要 |
These components comprise a reference frame (3) and a mobile frame (4) mounted slidingly in the plane of the reference frame. After placing electrode E and, consequently, electrode M, which are carried by telescopic arms fixed to the reference frame, the mobile frame is moved in order to place electrodes A and I, fixed to the latter. The correct ratio of distances OE and OM is obtained by reading a fixed scale (37) integral with the reference frame and a mobile scale (45) cooperating with a needle (49) integral with the mobile frame. The mobile scale is articulated (at 451) on a lever mounted pivotally on the reference frame at one end (461) and whose other end bears against a reference backrest (1). |
