| 摘要 |
1. Instrument of the mason's level type, comprising : - a water-tight circuit filled with mercury, constituted by a supple hose (1) of small inner diameter connecting two tanks (4) of small capacity, two supple diaphragms (5), the volume of each tank (4) being limited by one respective diaphragm (5) from said supple diaphragms, - means for electrically controlling the horizontal level, actuated by said supple diaphragms (5), said instrument being characterized in that it further comprises an adjustment system constituted by a third tank (12) communicating with said water-tight circuit (1, 4) and whose volume can be adjusted by a third diaphragm (14) deformable under the action of adjustment means (13) integral with said third diaphragm (14). |
