Chemical engineering . iallysuitable for use in connection with active material for negativepole plates. The expansion of the material may continue untilthe original volume has been doubled or more, and by thisaction the loss of capacity of the negative plates during theirlife is prevented. The active material thus prepared expandsfrom the plate, gradually loses contact, and may in a short timefall oflf and leave the grid bare, and in order to prevent this,the spaces of the grids which contain the active material arecovered by perforated retaining plates. The receptacles orspaces of the grid a
Chemical engineering . iallysuitable for use in connection with active material for negativepole plates. The expansion of the material may continue untilthe original volume has been doubled or more, and by thisaction the loss of capacity of the negative plates during theirlife is prevented. The active material thus prepared expandsfrom the plate, gradually loses contact, and may in a short timefall oflf and leave the grid bare, and in order to prevent this,the spaces of the grids which contain the active material arecovered by perforated retaining plates. The receptacles orspaces of the grid are only partly filled with active material,so as to leave ample room for further expansion. Fig. 3 rep-resents alternate constructions of plates embodying this prin-ciple, showing the perforated plates a, the grid b and the activematerial c, which can grow into the empty spaces d. A furtherseries of alternative constructions embodying the same prin- March. 1905. | F.[,(?[(F^M(^\r. .WD MFTAfJ-lRGICAL 5. -STORAGE BATTERY PLATESTRCCTION. ciple in its application to one plate or two platt-s superposedupon each other are described in the Battery Electrode.—E. A. Sperry, Cleveland. .As-signor to Xational Battery Buffalo. Patent 781,795,Feb. 7, 1905. .\pplication tiled Jan. 27, electrode consists of a framework of vertical and hor-izontal bars, providing rectangular openings. The frame is preferably cast of an-timonial lead in upperand lower half sec-tions, which a r eburned together orconnected by . of the rectangu-lar openings containsa separate electrodesection which is fast-ened to the frame atits upper edge only,thus leaving spaces allaround between itsside edges and theframe. Each section is wrapped over with strips of pyr-oxyline fabric, .so as to retain the active material. The sec-tions are retained in the frame opening by lugs which extendfrom the frame, and are so located that the bending of eachelectrode sect
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
