. Electric railway journal . al, reverseand intermediate positions of the switch points. Another type of the two-position Model 15 relay incor-porates a tower-indicator attachment, thus providing atower indicator with the functions and refinements of astandard relay. It can be furnished as a single or doubleelement, line or track relay. The indicator can be ofeither the semaphore type which is shown on the rightside of the illustrations or the disk type. The same company has also developed an alternatingcurrent crossing warning bell of the electromagnet size and general features it is
. Electric railway journal . al, reverseand intermediate positions of the switch points. Another type of the two-position Model 15 relay incor-porates a tower-indicator attachment, thus providing atower indicator with the functions and refinements of astandard relay. It can be furnished as a single or doubleelement, line or track relay. The indicator can be ofeither the semaphore type which is shown on the rightside of the illustrations or the disk type. The same company has also developed an alternatingcurrent crossing warning bell of the electromagnet size and general features it is identical with theirdirect current crossing bell, the operating mechanismsof the two being interchangeable. An adjustment is pro-vided by which the frequency and the intensity of thestrokes can be varied through a wide range. Furnace for Burning Insulation fromCopper Wire The brick furnace shown in the accompanying illus-tration is used by the International Railway, Buffalo,N. Y., for burning the insulation from old wire. It. FURNACE FOR BURNING INSULATION FROM OLD WIRE consists of a brick chamber, lined with fire brick, about4% ft. deep x 5 ft. wide x 7 ft. high, inside brick chimney on the rear projecting about 8 the roof furnishes the necessary draft. A grate is located about 18 in. above the floor, madeup of sections of ordinary boiler grate resting uponiron bars attached to the side walls. A sheet-iron dooris provided to cover the front opening from the topdown to the grate level. The furnace is charged with field coils, armaturecoils, line wire, etc., by inserting the grate in sectionsas required. This method of charging permits the wireto be handled readily. When the furnace is fullycharged, its contents are covered with kerosene, thesheet-iron door is put into place and the charge isignited. The copper is removed perfectly clean, almostas if dipped in an acid bath. A furnace of this kind provides a convenient placefor storing scrap copper wire whil
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