w plant for the treatment of sewage by fil- pert as > es CINCINNATI, 0. tration, and predpitation of the organic matters by Only $3.00 a Year, including Postage. Weekly. WORK SPECIALTY. (Mention this Pape) Eme. With 3 illustrations. Contained in SCIENTIFIC 52 Numbers a Year. We build Automatic… … DYNAMO -ELECTRIC MACHINES.—A or Canada, on receipt of three dollars by the pub- ELECTRIC CONVEYORS.—DESCRIP- and Timber by the use of Antiseptics. A paper by J. P. study of the leading types of these apparatus. Illus- Card describing the method of treating wood by the lishers; six months, $1.50;…
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