weight required on the weighing anus for the zero reading. If the upper head moves after the taking of the zero and before that with the wind on is secured there will be a resulting error eX- when' e is the lateral movement and W is the weight of the upper head with all the parts directly attached… … FlOVRK 13. (about 0.1 mm.) is permissible. It is, however, easy to calibrate the V. F. arm with dead weight, and to adjust the knife-edges in accordance with the calibration. The most serious fault to which the V. F. measurements are liable arises from the inclina- tion to the horizontal of the…
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