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The April number of TJie Ifanufaciurt and Builder is a capital onc. Ainong tli illustrated artlcles are : Latcst improvc ment on Ice Machines, Microscopio Photo grapby, The Application of Ceraents fo Submarino Constractlons, Jute, Dlftllng The Supposed Loss of Power by the Cr&nl Motion, Continental Works, Greenpoint Long Island, Electrotyplng, Iron-Clat Ilouses, The Engines of the Brooklj-i Water-Works, .te. Every mechante anc artisan will find omethlng to their liking in the monthly numbers oí tlis pcrioüicul. $1.50 a year. Addrcss Wzstbrh & Co., 37 Park Kow, N. Y.