[Electric engineering.] . fig. 28. a leather washer being placed between the nail head andthe porcelain, to prevent the latter from being 27 is a kno~b cleat used for supporting single wireswhere something neater than the ordinary knob is does away with the necessity of a tie-wire and is pro-vided with four differ-ent sized grooves sothat it will accommo-date wires of variousthicknesses. Fig. 28shows a double-headedtube used when wirescross each other. Por-celain tubes should al-ways be used wherecrossings of this kindoccur. The tube, , is frequently usedfor this
[Electric engineering.] . fig. 28. a leather washer being placed between the nail head andthe porcelain, to prevent the latter from being 27 is a kno~b cleat used for supporting single wireswhere something neater than the ordinary knob is does away with the necessity of a tie-wire and is pro-vided with four differ-ent sized grooves sothat it will accommo-date wires of variousthicknesses. Fig. 28shows a double-headedtube used when wirescross each other. Por-celain tubes should al-ways be used wherecrossings of this kindoccur. The tube, , is frequently usedfor this purpose; butif this is done, the endwithout a head shouldbe taped to the wireto prevent the tubesliding along. Fig. 29shows a fused rosette or ceiling cut-out. These rosettesare made in two parts, a and b. Part a is screwed to the. Fig. 29. 48 INTERIOR WIRING. §26 ceiling and the lamp is hung from the cap b. The linesare attached to the terminals c, c and the lamp cord tod, d; /,/ are the small fuses. When the cover b is attachedto a by a twisting movement, terminals g, g lock with h, h!and make the connection from the mains to the lamp. Thecord should be knotted at i so that the pull will not comeon the connections d, d. 66. For such work as is now being considered, the prin-cipal porcelain articles required are the cleat, the rosette,and the cut-out. These are all made in several forms; somecleats are to be fastened with nails, others with screws. Theselection of such fittings must be made with reference tothe work in hand; for instance, cleats cannot be put upwith nails on plastered walls, because the driving of nailswill crack the plaster. If the -wires are placed high out of reach and the distancebetween the points of support is considerable, they should beseparated a foot or more and fastened to knobs. Wh
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