Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 253
the beam does not rub against the sides of the slot. Increaseddelicacy could be attained by projecting beyond the support oneend of the knife-edge and attaching to it a long pointer readingon a scale upon the lower part of the post. In using these scalesit would probably be best to weigh by… … A form of Post-office balances is shown in Fig. 122. Thebeam A is mounted on the post P, and carries a sliding-weightW. The play of the beam is limited by the stops 88. The scaleon the beam is spaced off by finding, by trial with various CONSTRUCTION OF APPARATUS. 241 weights, the average space…
Physics
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