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Scientific American, Vol. 58, No. 11 (March 1888) (1888)

leaf 4

An illustration from Scientific American, Vol. 58, No. 11 (March 1888), 1888, leaf 4
and a second piece cast. This gives record will be kept of all such data, and blue prints will tions on a dial plate ; a duplex pendulum seismograph two corresponding pieces of lead. be made of the.diagrams and copies of this sent to the to give independent records on a dial plate, the pencil… … marked the beginning of the dark shading, diminishing COHESION-SUBBING BLOCKS TOGETHER. LEAD COHESION BLOCKS-THE MOULD. ©1888 SCIENTIFIC AMERICAN, INC.

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