peated. If, however, meter pendulum a little later. More recently Dr. T. C. the pendulum be slightly slow or fast in relation to the a rock or a pier, the chamber is leveled and the pendu- Mendenhall, superintendent of the United States Coaist chronometer, the mirror will not be precisely in this… … ble to get a fair rate from an obser- 10 per cent and copper 90 per cent, a composition which has a very high resistance to cor- ber, the air pump is attached, and the pressure in the vation from a single pair of coincidences, the time con- chamber is reduced to about 50 centimeters, as indi-…
Patents · Munn · Wheat · Scientific American · Fiftieth · Winter wheat · Prize essay · Fiftieth anniversary · Fifty years · Anniversary number · Sewing machine · Large number · Trade mark · Half century
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