[Electric engineering.] . —Ordinary snap switches are gen-erally of a style similar to that shown in Fig. 21. They are mounted on porcelain bases and the work-ing parts are covered by a metal cap. Aswitch of this kind is comparatively inex-pensive, but it projects from the wall anddoes not make as neat a job as a switcharranged so that the working parts setinto the wall. Moreover, they are alwaysfig. 81. more or less liable to damage and take up space. The other type is known as a flush switch. Likesnap switches, they are made in a large variety of styles andsizes. Fig. 22 gives an idea as to
[Electric engineering.] . —Ordinary snap switches are gen-erally of a style similar to that shown in Fig. 21. They are mounted on porcelain bases and the work-ing parts are covered by a metal cap. Aswitch of this kind is comparatively inex-pensive, but it projects from the wall anddoes not make as neat a job as a switcharranged so that the working parts setinto the wall. Moreover, they are alwaysfig. 81. more or less liable to damage and take up space. The other type is known as a flush switch. Likesnap switches, they are made in a large variety of styles andsizes. Fig. 22 gives an idea as to the arrangement of a flushswitch. In this case the switch is operated by pushingthe button projecting through the plate. The workingparts are encased in porcelain and the face plate may begiven any finish required to match the other hardware trim-mings in the building. One of the terminals is shown at one button is pushed in, lever / makes contact with c, c,thus completing the circuit. Snap switches, Fig. 23, are. §27 INTERIOR WIRING. 43 also made so that they may be mounted flush with the switches are mounted flush, an iron box should beprovided in which to place them. Fig. 24 shows a switch
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