. Electrical world. FIG. I.—SECTION AiNU B.\SE tegral part of the switchboard, and all of its ionnections be of apermanent character like those of the other instruments; that itshould be hung out upon brackets, so as to be visible from any pointdown the line, and normally register bus-bar voltage; and thateach generator panel should be provided with a spring-actuatedfly-back switch, by which the voltmeter is made to read across theterminals of that particular machine when the switch is operated,automatically returning to its bus-bar reading as soon as the switchis released.
. Electrical world. FIG. I.—SECTION AiNU B.\SE tegral part of the switchboard, and all of its ionnections be of apermanent character like those of the other instruments; that itshould be hung out upon brackets, so as to be visible from any pointdown the line, and normally register bus-bar voltage; and thateach generator panel should be provided with a spring-actuatedfly-back switch, by which the voltmeter is made to read across theterminals of that particular machine when the switch is operated,automatically returning to its bus-bar reading as soon as the switchis released. This would do away with all of the tramping, and isjust what is accomplished through the little device illustratedherewith. The switch itself, which is the essential feature, is of the push-button type, and has its moving parts all behind the board. It is. FIG. 2.—DI.\GR.\M OF CONNECTIONS. essentially a double-pole, double-throw switch, but is made witheight contact points, as shown, for mechanical reasons, and becauseit is desirable to break contact at more than one point at once, toavoid the possibility of arcing. The switch, as here constructed, has four pairs of contacts,A, B, C and D, two of which, A and D, open toward the front, andthe other two toward the back. Each pair of contacts is arrangedto be closed by one of four V-shaped plugs, E, which are carriedon a cross-bar, F, operated from the front of the board by the push-button, G. A spiral spring, H, serves to hold the switch in its for-ward position with the contacts B and C closed, until the button ispressed, when S and C are opened and A and D are closed. When April 23, 1904. ELECTRICAL WORLD and ENGINEER. 771 the button is released, the switch immediately returns to its originalposition. The push-button rod, cross-bar and base plate, K, are of hardrubber, while the conta
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
