[Electric engineering.] . he walls on which the wires are to be concealedare of brick or stone or other masonry, a conduit systemoffers the only method of concealing the wires that is atonce practicable, economical, and permanent. It is the sys-tem to adopt for all concealed work in new fireproof build-ings and in all other new buildings except those wheremost of the walls and partitions are of frame covered withlath and plaster, leaving ample space and easy work forknob-and-tube construction. In large buildings where there are to be many electricconduits, architects usually provide channels i
[Electric engineering.] . he walls on which the wires are to be concealedare of brick or stone or other masonry, a conduit systemoffers the only method of concealing the wires that is atonce practicable, economical, and permanent. It is the sys-tem to adopt for all concealed work in new fireproof build-ings and in all other new buildings except those wheremost of the walls and partitions are of frame covered withlath and plaster, leaving ample space and easy work forknob-and-tube construction. In large buildings where there are to be many electricconduits, architects usually provide channels in the brick-work in which the conduits can be placed, so as to bringthem behind thesurface of the brick without having to cutthe brick with a chisel after it is in place, which is a labori-ous and objectionable method. /. 11.—20 62 INTERIOR WIRING. 27 67. Drawing Wires in Conduits.—When the wires areto be drawn into conduits, it is a good plan to blow soap-stone through first, as it makes the wire slide through easier. Fig. 38. and take the ells better. A snake is first run throughthe tube and the wire pulled through by means of it. Thesnake usually consists of a steel ribbon about \ inch wide § 27 INTERIOR WIRING. 63 With a ball about £ inch diameter on the end. If the con-duit has many turns, it is advisable to use a coiled spiralspring about ^ inch diameter and 6 or 8 inches long with aball on one end and the other end fastened securely to thesteel ribbon. The end with the piece of spring is pushed infirst and the spring passes around the turns easily. 68. Fig. 38 shows one floor of a dwelling house wiredwith conduits. The numbers on the various outlets indicatethe number of lamps supplied. The wiring is carried outon the loop system, and it will be noticed that no branchesare taken off between outlets. Four circuits are used inorder that there may not be more than ten lamps on anyone circuit. WOODEN MOLDINGS. 69. Wooden moldings are used to a great extent in running w
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