Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 261
s well to state here, however, that any economy inthe construction of a switch-board that will tend to decrease its dura-bility and reliability of action is poor economy indeed. As an illustration of the highest development attained in spring-jack construction during the period when the magneto… … FIG. 210.—FLAX VIEW OF MULTIPLE J.^vCK STRIP. board by the removal of two screws which bound it firmly to theframework. Figs. 210 to 213, inclusive, show the details of theconstruction-of one of these jack strips. The hard rubber strip, a, forms the framework for each strip oftwenty jacks. The…
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