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1068 HANDBOOK OF PROJECTION FOR
confusion in terms may be avoided. Whenever or
wherever the term "horn" is used, the large-mouthed
shell attached to the receiver of a sound projector is meant.
We will first examined the loud speaker used in connection with Western Electric equipment, which consists of a small metallic receiver and a horn of carefully calculated length and shape.
THE RECEIVER. — First we will consider the receiver, a diagrammatic cut-away view of which we have
in Fig. 397. This explanation of the receiver is not made with any idea that the projectionist wili cv^. ~j called upon to repair or adjust receivers, but from the broad viewpoint that men should have an understanding of the construction and the functioning of
Figure 397.
every part of the apparatus they have charge of and must work with. Unquestionably such knowledge adds to their efficiency, and to the efficiency with which they will be able to handle the equipment.
Diaphragm A, Fig. 397, is made from very thin aluminum alloy. Its central portion is cupped into portions of two spherical surfaces, as you may see by examining
Fig. 398 shows the receiver unit complete, all ready for attachment to the horn. B is the receiver front plate. C is the part which is mounted in front of B to complete the sound chamber, the two faces of which are shown at X. The receiver unit has a threaded boss permitting its attachment to the horn. Bf and C; indicate parts B and C in place upon the receiver, where they are locked into position by nut D.