The new international encyclopaedia . l action aridby loss of water. If worked hard they are liableto burst by gas pressure. The Cell is shown in section inFig. 8. The cylindrical containing vessel, Z, isthe zinc electrode. Itis covered with a eani-board case, A, and thespace between tlie twois filled with A thin layer ofbituminous conjpound,E. in the bottom of Zinsulates the carbonrod C from tlie the carbon isplaced a depolarizingpaste, F. It is held inposition by a canvasbag. Outside this isthe white paste G, con-taining the cell is finished o
The new international encyclopaedia . l action aridby loss of water. If worked hard they are liableto burst by gas pressure. The Cell is shown in section inFig. 8. The cylindrical containing vessel, Z, isthe zinc electrode. Itis covered with a eani-board case, A, and thespace between tlie twois filled with A thin layer ofbituminous conjpound,E. in the bottom of Zinsulates the carbonrod C from tlie the carbon isplaced a depolarizingpaste, F. It is held inposition by a canvasbag. Outside this isthe white paste G, con-taining the cell is finished offwith a bituminous seal, H, through which passesa small vent tube, V. The black paste containsmanganese dioxide, and the white paste am-monic chloride. Both are reduced to a pasty con-dition by the addition of lime and ferric oxide orzinc oxide. The OB.\cn Cell is substantially the same asthe Hellesen except that the electrolytic pasteconsists of about 85 per cent, plaster of Paris and15 per cent, flour, moistened with a solution of. sal ammoniac. Tliese are good types of dry cellsand they illustrate a whole class. Figures !) and 10 exhibit graphically tests of aLeclanchf and an Obaeli dry cell cell was on a closed circuit through an ex-ternal resistance of five ohms for one hour;the recovery from polarization was traced for thefollowing hour, the data for the latter being plot-ted backward toward the starting point. Thepolarization of the dry cell was somewhat lessthan that of the LeclanchCs but after the firstfive minutes the current through the Leelanch6was more constant in value than that throughthe dry cell. Standaki) Cells. A standard cell is employedas a standard of electromotive force. It is not S X o 05 « t-_J o> ..J OV^R- r ^^ ^^ —_ — -^ -*i^ V r p- \ *? — 1— .. h-ULARI^^T.^;, L —^T rn TTF L- _ * — ? ? f~ — — I y \ s ^ ^ =ii Hi. RE_ cu ^R :ni ( D 2 0 Ml NU TE 45. 0 6 Fig. 9. DIAGRAM BIIOWIXG TEST OF A LECLAN
Size: 1241px × 2013px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernewyorkdoddmead
