a one-half placing the apparatus upon its support, which may be pearance will be continually repeated. 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,… … an error less than one part in vidual number. The pendulums 2,500,000. It has been found possi- are made of an alloy of aluminum 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- chamber is reduced to about 50…
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