. Electric railway journal . d headlight at each end, a bell gong and air whistle. The 6oo-voltlocomotives of this company were described in the ElectricRailway Journal for Jan. 6, 1912. ELECTRO-PNEUMATIC VALVE FOR CURRENT The Z armature electro-pneumatic valve magnet shownin the accompanying illustration has just been developed bythe Union Switch & Signal Com-pany for the control of electro-pneumatic switch and signal ap-paratus by alternating current. Itconsists essentially of a Z arm-ature rotating in a magnetic field,both armature and field cores be-ing made of laminated
. Electric railway journal . d headlight at each end, a bell gong and air whistle. The 6oo-voltlocomotives of this company were described in the ElectricRailway Journal for Jan. 6, 1912. ELECTRO-PNEUMATIC VALVE FOR CURRENT The Z armature electro-pneumatic valve magnet shownin the accompanying illustration has just been developed bythe Union Switch & Signal Com-pany for the control of electro-pneumatic switch and signal ap-paratus by alternating current. Itconsists essentially of a Z arm-ature rotating in a magnetic field,both armature and field cores be-ing made of laminated a lever the armaturedrives a crank of which one armappears in the illustration andthe other arm of the crank pressesdown on the head of the pin valvestem when the magnet is ener-gized. The whole instrument ispronounced to be very compact,neat and efficient. The cover ismade of aluminum and is de-signed to be screwed into placevery readily. A spring is at-Magnet Valve tached to the cover to prevent it from working UNION CLAMPS FOR METAL BLADES A clamp for holding metal signal blades in place has re-cently been put on the market by the Union Switch & Sig-nal Company. The clamp is made of steel, stamped cold,sherardized and painted in two lengths suitable to the taperof the blade grip with which it is to be used. Both lengthsfit accurately in the corrugations of the blade, and thespacing of the bolt holes is the same in each. The detailparts of the clamp include protecting pads of cow hairwhich are placed between the clamps and the to pro-tect the enamel from abrasion and to take up any strain due to inequalities of the metal. These pads are of dif-ferent lengths, corresponding to the clamps under whichthey are used. Two pads are placed between the blade andthe spectacle at right angles to the other two pads. Nutlocks made of sheet steel are also used. A portion of theclamp is raised to act as a stiffener and to keep the boltheads from turning. The nut locks, bolts
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
