National Geographic : 1923 Jul
What's in your telephone This picture, taken "behind the scenes", gives some idea of the complexity of your telephone. To select the raw materials and refine them, to produce from them the finely-wrought coils and contacts and diaphragms, to as semble the many parts into a smooth-working and long-lasting telephone-all this calls for a manufacturing skill of high order. Western Electric telephones are the product of fifty-four years' manufacturing experience. Western Electric Since 1S69 Makers of Electrical Equipment No. 4 of a series on raw materials, ALUMINUM Diaphragm for transmitter. SILK In covering on receiver and extension cords. IRON Magnet struc ture. Terminal and base plate, clamp and screws. COPPER Coil windings. (As brass) re ceiver termi nals, screws, handle. RUBBER Receiver case; diaphragm cap. WOOL Felt pad at base of telephone. FLAX NICKEL MICA In linen pa- Contact springs; Diaphragm in per in trans- for plating trans- transmitter mitter button. mitter parts. button.