. Public works . s are arranged withinconvenient reach of the operators the illustration the tamper isshown at work tamping preparatoryto the laying of a sidewalk. SEMI-PORTABLE GRAVEL, WASHING AND CRUSHING PLANT. 2, 1914. MUNICIPAL JOURNAL Iving in a tank in which waterkept to the level of an apron inU front. The water—averaging usuallyabout thirty-five gallons per minute—•is piped under a moderate head intothe discharge end of the tank. Thematerial falls into the water and isdisintegrated by one-inch bars extend-ing between and into the opposingfaces of the heavy cast hoods. Thesebar
. Public works . s are arranged withinconvenient reach of the operators the illustration the tamper isshown at work tamping preparatoryto the laying of a sidewalk. SEMI-PORTABLE GRAVEL, WASHING AND CRUSHING PLANT. 2, 1914. MUNICIPAL JOURNAL Iving in a tank in which waterkept to the level of an apron inU front. The water—averaging usuallyabout thirty-five gallons per minute—•is piped under a moderate head intothe discharge end of the tank. Thematerial falls into the water and isdisintegrated by one-inch bars extend-ing between and into the opposingfaces of the heavy cast hoods. Thesebars are one inch apart and are sup- at 300 to 400 revolutions per ^ full line of trommels and elevatorsare also offered. The illustrations show the disin-tegrating and washing screen andsemi-portable outfit. CONCRETE JOINT PROTECTIONPLATE. Albert Moyer, 200 Fifth .\venue,Xew York City, is making a new type by bending the legs out so that a chairis formed. ■IMPROVED DERRICKS WITHCONVERTIBLE iff^!^^^ IMPROVED SCRAPER AND EXCAVATOR DERRICKS ported by heavy cast spiders whichcarry the weight of the screen. Out-side this revolving grizzly is a per-forated metal jacket, with holes of anysize desired, held in place by drawbands. On the outside of this jacketare the elevator cups. The finer ma-terial passes through the perfora-tions into the tank, is carried away bythe elevator cups and discharged onan apron from where it may be con-ducted to any point. The coarse ma-terial and all boulders are picked upby a plow-shaped casting tothe inside of the cast hood at the dis-charge end and are elevated out of thewater and slid down the discharge intoa hopper, the jaws of a crusher or apicking table as the case may be. The machine is built in three sizes,varying in the length of the perforatedjacket. It may be driven from a gaso-line engine, small steam engine orelectric motor. .\ whole portablegravel washing plant consists of a dis-integrating screen complet
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
