Architect and engineer . of the in-coming secondary bus. Each of these pushbuttons is under glass, but it is possiblethrough their use to isolate the entire build-ing from the electric service. The transformers in the Battery Streetvault and those in the top of the buildingare connected on their primary side to dif-ferent sub stations of the Pacific Gas &Electric Company which insures continu-ous power to the building through one orthe other bank unless there is a serious sys-tem outage. The lighting panel boards in the build-ing are made up of small single pole West-inghouse circuit breakers,
Architect and engineer . of the in-coming secondary bus. Each of these pushbuttons is under glass, but it is possiblethrough their use to isolate the entire build-ing from the electric service. The transformers in the Battery Streetvault and those in the top of the buildingare connected on their primary side to dif-ferent sub stations of the Pacific Gas &Electric Company which insures continu-ous power to the building through one orthe other bank unless there is a serious sys-tem outage. The lighting panel boards in the build-ing are made up of small single pole West-inghouse circuit breakers, instead of theusual switches and fuses. Provision is made for the distribution oftelephone and signal wires and wires forconvenience outlets, through all floors ofthe building by the installation of under-floor duct with preset inserts which in gen-eral consists of two parallel ducts, each pairbeing spaced approximately eleven feetfrom the next pair, with junction boxes atall intersections. A liberal system of con-. DETAIL OF TOWER PARAPET, SHELL BUILDINGGeo. W. Kelham, .\rchitect 54 ARCHITECT AND ENGINEER, July, 1930 duit feeders are run to these junction boxesfrom the telephone terminals at the tele-phone riser shaft and from the lightingpanel boards. The building is also provided with apneumatic tube system with stations on alloffice floors. The compressors for operatingthis system are located in the main machin-ery room of the sub-basement, the cen-tral station being on the second vertical distribution of mail, inter-of-fice correspondence and dictaphone recordsmay be handled through this tube horizontal distribution is handled byhall boy attendants whose desks are locatedat each individual floor station. As the building is a symmetrical towerand widely separated from other buildingsit was a subject particularly adapted toflood lighting. Its exterior color and finishwas also very favorable to this form of il-lumination. Flood lighting equipment wasacco
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