. Journal of electricity. on the outer face of each disc and the line wires are attachedto these arms. Arranged to one side of the shaft is a fixedconductor provided with contact clips into which the arms aremoved to close the circuit when the shaft is rotated. Electric Annunciating SystemPatent No. 1,245,485, issued to David L. Martyn of NorthYakima, Washington, shows an electric annunciating device is particularly designed for a call system for hotelsand comprises a rotating drum having rows of aperturestherein corresponding in position to definite times. A contact <--£. finger
. Journal of electricity. on the outer face of each disc and the line wires are attachedto these arms. Arranged to one side of the shaft is a fixedconductor provided with contact clips into which the arms aremoved to close the circuit when the shaft is rotated. Electric Annunciating SystemPatent No. 1,245,485, issued to David L. Martyn of NorthYakima, Washington, shows an electric annunciating device is particularly designed for a call system for hotelsand comprises a rotating drum having rows of aperturestherein corresponding in position to definite times. A contact <--£. finger is arranged in the plane of each row. The drum isrotated by a clock mechanism and the apertures in any onerow pass the contact finger at certain fixed times. 40 JOURNAL OF ELECTRICITY [Vol. XL —No. 1
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
