Popular science monthly . tbetween the segments. There will be8 segments altogether. To the outsiderim of each of these a i-ft. No. 18 annun-ciator, or bell wire is soklered. A metal arm, which ])resses down uponthe plates with sufficient force to insurean electrical contact, is soldered on thepivot rod a short distance above its is made from spring-brass 3^2 •!• counteract its spring-like action, whichotherwise would force the rod and thearrow upwards, a ring or flange shoukl besoldered to the rod immediately below thebox cover. The tension of the swingingcontact should then b
Popular science monthly . tbetween the segments. There will be8 segments altogether. To the outsiderim of each of these a i-ft. No. 18 annun-ciator, or bell wire is soklered. A metal arm, which ])resses down uponthe plates with sufficient force to insurean electrical contact, is soldered on thepivot rod a short distance above its is made from spring-brass 3^2 •!• counteract its spring-like action, whichotherwise would force the rod and thearrow upwards, a ring or flange shoukl besoldered to the rod immediately below thebox cover. The tension of the swingingcontact should then be adjusted so that,vhen the cover of the box is on, the arrowwill swing freely, but at the same time thearm will make firm contact with thesegments. To the metal socket into whichthe base of the rod fits, another i-ft. lengthof No. 18 annunciator wire should besoldered. The directions of the compasstowards which each of the segments pointshould l)e indicated by tags on the wireswhich lead from them. This is The vane witi its slider-arm for mak-ing electric connections with the dial Otherwise, confusion of an amusing varietywill result when the dial is connected andthe batteries are in circuit. A westerlywind may be registered as southeast, should be bored in the bottom of thebox, to drain off rain water. A cable of 9 annunciator wires, properly indicated by numbers or letters at the enilof each, should l)e made as follows: Stretchbetween 2 points, which are as far apart asthe distance from the vane to the dial, the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
