. Electrical news and engineering . umulator with 17 plates, 10 by 12 inches, isreckoned, in horse-power hours, equal to about onehorse-power hour. Taking this as a basis, it will re-quire 6 cells for one horse-power for 6 hours, or 30 cellsfor 5 horse-power for the same length of time. To obtain the length of wire on an electro-magnet,add the thickness of the coils to the diameter of the coreoutside of the insulation, multipy by , again by thelength, and again by the thickness of the coils, anddivide by the diameter of the wire squared. Blotting paper, saturated with a solution of iodide
. Electrical news and engineering . umulator with 17 plates, 10 by 12 inches, isreckoned, in horse-power hours, equal to about onehorse-power hour. Taking this as a basis, it will re-quire 6 cells for one horse-power for 6 hours, or 30 cellsfor 5 horse-power for the same length of time. To obtain the length of wire on an electro-magnet,add the thickness of the coils to the diameter of the coreoutside of the insulation, multipy by , again by thelength, and again by the thickness of the coils, anddivide by the diameter of the wire squared. Blotting paper, saturated with a solution of iodide ofpotassium to which a little starch paste has been added,forms a chemical test paper for testing weak the paper (slightly damp) is placed between theterminals of a battery, a blue stain appears at the anode,or wire connected with the carbon or positive pole ofthe battery. Scientific .Xmerican. CflrJADIflfa ELiECTRlCAb ^lEWS StpUMiiber, uSgb GflNflDlflN flSSOGIflTION OF STflTIONflRYENGINEERS SEVENTH ANNUAL Kingslcn, Preside Till; limestone city of Kingston was honored this yearas the seat of the seventh annual convention of the Cana-dian Association of Stationary Engineers, which wascalled for the 17th, 18th and 19th of August. The dutiesof entertainment therefore devolved upon KingstonBranch No. 10, and the manner in which the delegateswere received proved conclusively their qualifications in this respect. Whilethe number in attend-ance was not aslarge as desired, theconvention through-out was extremely in-teresting and enjoy-able. By the kindness ofthe city authoritiesthe Council chamberwas placed at the dis-posal of the associa-tion, and at 10 a. delegates con-vened in Executive Com-mittee was fully re-presented as follows:W. G. Blackgrove,Toronto, president ;J. Devlin, Kingston, vice-president; Philip, Toron-to, secretary; R. C. Pettigrew, Hamilton, treasurer; Chapman, Brockville, conductor; F. G. Johnston,Ottawa, doork
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