| 摘要 |
A top loading precision balance having a weighing pan held horizontal by a parallelogram linkage is provided with a set of coaxial, annular weights mounted on the stem of the pan above the secondary or suspension pivot which connects the balance beam with a vertical pan carrier member of the linkage. The weights may be lifted from the stem of the pan in any desired combination by means of lifters operated by cams on a single control shaft, but remain coaxial in all positions, their common axis passing through the center of the pan and being laterally offset from the upright pan carrier, which is parallel to a stationary support member in the parallelogram linkage.
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