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The Shaw and Geary Electric Bell | |
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 | The Shaw & Geary Electric Bell - 1887 Messrs. Shaw & Geary, manufacturers of electrical appliances, of 53 & 55 North Seventh street, Philadelphia, have produced a standard form of electric bell, which embodies a number of improvements in detail over the bells in common use. They will be appreciated by those familiar with this class of apparatus, from the following description: It is well known that bells having the usual cast-iron frame, will become polarized after some little use, by reason of the residual magnetism retained therein, and, in consequence, the movement becomes sluggish and the bell weak. To overcome this defect, the makers above named employ for the construction of the cores, armature and frame of their apparatus, the best Norway iron, a brand which is the purest iron known commercially, and which is not disposed to retain its magnetism. The makers nickel-plate the armature in order to prevent rusting. The spring is made of German silver, and is so constructed as to be readily adjustable for light or heavy currents. The contact points are made of platinum, securely riveted in position. The magnets are carefully wound to 3 1/4 ohms resistance with the best insulated wire. The binding posts have long screws, allowing two or more wires to be placed under the head without danger of the screw failing to engage, and both binding screws and gong are nickel-plated. The case is of polished ash or black walnut, and is attached by a snap-catch, which is simpler and better than the hooks ordinarily employed. The working parts are attached to the iron frame, in order that the adjustment of the instrument shall not be disturbed by the warping of the base board. The foregoing details, taken singly, appear to be of minor importance, but taken collectively, add substantially to the utility of the device. These bells are not only furnished with the ordinary gong from 2 1/2 to 6 inches inclusive, but also the dome, fancy, open, Mikado, Swiss and rectangular patterns. The Manufacturer and Builder, September 1887 |