| 摘要 |
1,107,179. Weighing apparatus. MEPAG A.G. March 7, 1967 [Nov. 17, 1966], No.10740/67. Heading G1W. A precision balance comprising a scale pan 12 mounted at one end of a pivotally supported beam 8 is provided with one or more adjustable taring springs 17 and an optical system by which a graduated scale 10 on the beam 8 is projected on to a screen mounted in the frame 4 of the balance, an objective lens 21 of the optical system being mounted at one end of a pivotally supported pendulum member 24 which is so arranged as to be subjected to an additional force when the frame is tilted that for a given load on the scale pan 12 the reading of weight projected by the optical system is constant and independent of inaccuracies in the levelling of the frame 4. The additional force may be provided by a pair of magnetic members 28, 29 mounted respectively on the pendulum member 24 and a beam support column 5 of the frame 4 or by a spring (33) Fig. 3 (not shown) which is tensioned between the pendulum member 24 at its support knife edge 25 and an adjustable nut (35) on the frame 4. The pendulum member 24 may be provided with a counterweight 27 and an adjustable weight 31, and the scale pan 12 may be mounted on a carrier 13 connected to a link member 14 for parallel motion.
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