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Show HOW TO USE CONCRETE. j W. F. Fltzpatrlck Glvet Practical , Points for Amateur. Tho form or mold has to bo exact an.v.trong. If you wish to build n wall, tho boarding has to bo truo and plumb, set close together and proper ly braced, both sides If on Independent Indepen-dent wall, ono sldo If a retaining wall. This planking or tho forms retaining the concrcto In place should ho kept there until tho concrete Is absolutely well set. It Is better to err on the safo sldo and keep the forms up for n couplo of weeks than It Is to havo tho wholo thing crumblo by removing them too soon. Fatal concrete collnpses urc occurring oc-curring with all too great frequency, and hurry to occupy those building Is gonernlly to blnino If thoy fall. For ordinary walls, piers nnd such work, dry measures of concroto should bo ono of cement three of coarse, clean sand nnd six measures of clean gravel, broken stono or broken brick, broken largo or small ns tho naturo of the work demands, hut never crumbled into dust. Where gt eater strength 1b required, incrcaso tho cement propor tlonally. Tho nilxturo should bo fairly wet and thoroughly mixed, as wet as bricklayers usually havo their mortar will accomplish the best results. This mlxturo should bo poured Into tho mold or form and tamped with a heavy weight and not more than six or eight Inches thick nt a tlmo boforo tamping. It Ib difficult to Join It. so ono unit of tho work had best bo complotcd at tho ono operation. If a day has to olapso betweon times then lcavo tho edgo of tho finished work very rag ged and broken so that tho now may Impinge upon It In good shape. |