. Popular electricity magazine in plain English. city, Un-less time ; itthe cabin re 1424 Popular Electricity and the Worlds Advance ity in a downward direction. If then,the time of falling of the ball is reg-istered electrically, we have a methodof measuring the vertical velocity ofthe cabin. The same apparatus, bymeans of electrical control systemwhich cannot be described in non-technical language, can vary the re-sistance of the motor proportionally,and thus keep the cabin practicallysuspended in space. As far as preven-tion of rolling is concerned, the ordi-nary universal joint suspension
. Popular electricity magazine in plain English. city, Un-less time ; itthe cabin re 1424 Popular Electricity and the Worlds Advance ity in a downward direction. If then,the time of falling of the ball is reg-istered electrically, we have a methodof measuring the vertical velocity ofthe cabin. The same apparatus, bymeans of electrical control systemwhich cannot be described in non-technical language, can vary the re-sistance of the motor proportionally,and thus keep the cabin practicallysuspended in space. As far as preven-tion of rolling is concerned, the ordi-nary universal joint suspension is rec-ommended. little illumination is required andorative effect is desired. dec- ILLUMINATED PLAQUE A Holophane novelty is a translucentglass plaque made up so that it may beused as a wall or pillar decoration. Thespace behind the raised portion of thefigure is sufficient to permit the instal-lation of an incandescent lamp. Theplaque is finding use upon the walls atthe entrance to buildings, moving pic-ture, shows, art galleries, etc., where. ELECTRIC SAFETY FIRST SIGNS Electric Safe-ty First signsare now exten-sively employedby the LehighValley Railroadto impress uponits employes thenecessity forcarefulness. Thetwo here repro-duced are locat-ed at the com-panys Sayre,Pa., shops andare placed con-spicuously s othat every manentering or leav-ing the shops must see them. The let-tering is carried on frosted glass withstrong illumination behind.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
