Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 701
to prevent the emptyducts from forming flues in case of fire, all unused ducts are pluggedat both ends. The main distributing frame cannot be seen in Fig. 488, as it isbehind the stairways in that figure. Its position, however, is wellshown in the plan of 489. As will be seen from this floor plan… … FIG. 492.-FOYER-HOME TELEPHONE COMPANY, LOS ANGELES, GAL. are mounted in parallel lines with the subscribers relay rack andintermediate frame. In a separate rack extending in a line parallelwith the main distributing frame are mounted the service meters,these being used to a large extent in this…
Telephone
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