cale with a series of divisions can meter bars, which are kept in the custody of the Na- be engraved speedily. It is able to divide linear scales signals by wireless telegraphy from the standard clock tional Bureaii of Standards at Washington, and pre- of different lengths and with different… … is to keep the wood at a high temperature in closed respond now to 100 feet 3 Fig. 1.—COMPARATOR FOR STUDYING STANDARD METER BARS. vessels (about 250 deg. C.) and at the same time at a inches, and tapes divided high pressure, some 250 pounds per square inch. This the two standards in 1904, previous…
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