Popular science monthly . will work overthe contacts, as thehands did in theother case. In con-necting up the con-tacts it must be re-membered that eachpiece of file (row ofcontacts) is to beconnected with thesmall contact op-posite the corre-sponding hour. Theheavy dash-dot lineindicates the mainwires; one is connected with the hisu-laled hand and the other with the frameof the clock. The bell and battery arecoimected in series. In fastening thewires small pieces of muslin may beglued over them to hold them in placeand to avoid using staples or brads inthe clock face. When the hour hand passe
Popular science monthly . will work overthe contacts, as thehands did in theother case. In con-necting up the con-tacts it must be re-membered that eachpiece of file (row ofcontacts) is to beconnected with thesmall contact op-posite the corre-sponding hour. Theheavy dash-dot lineindicates the mainwires; one is connected with the hisu-laled hand and the other with the frameof the clock. The bell and battery arecoimected in series. In fastening thewires small pieces of muslin may beglued over them to hold them in placeand to avoid using staples or brads inthe clock face. When the hour hand passes over thecontact corresponding with, say, thehour 5, the row containing 5 corruga-tions is thrown in the circuit, and whenthe minute hand comes around to 12, itsbrush passes over the large contact. Asthe current is only in one piece of thefile—i. e., the one corresponding withthat hour, all the others are dead. Thebrush trips from one notch to the next,causing the single-stroke bell to strikefive times.—R. L. 138 Popular Science Monthly m:j3: Kr^ i / f Porce/(7in c/eaf 0 y
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
