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Scientific American, Vol. 7, No. 29 (April 1852) (1852)

leaf 2

An illustration from Scientific American, Vol. 7, No. 29 (April 1852), 1852, leaf 2
g and break the the nineteen bells immediately begin to circuit of three and a half miles, liberates nine the circuit is completed. At the City Build- circuit in such a manner as to signalize the strike two-second blows. After a minute or bell hammers at the same instant. ing, in Boston, an… … By a multiplication of signal stations, and a nets mounted on the same stand and connect- pin, e, is arrested at the end of one revolution. suitable provision of bells, the Telegraph the three alarm circuits, which are called into ed, one with each of the three signal circuits; This occupies two…

Patents · Signal · Zinc · Claim · Ore · Attached · Secured · Woodworth patent · Three inches · Water space · Swinging frame · Long hair · Central station · Jersey zinc · White zinc · Zinc ore · Patent office

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