the tunnel proper will be 22 feet in diame- is provided with two or three interchangeable weights, ter, and the distance from one river bank to the other has not yet given entirely satisfactory results. varying from two to six pounds, and the lower end is The investigation of the clearness and… … to it an alcoholic solution of aniline of any tunnel, as finished, will consist of 2,500 feet COMPOUND PENDULUM. desired color. The glass plate is prepared on the American side, 2,200 under the river, for use by flowing the collodion over it and and 4,000 feet on the Canadian side. There allowing…
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