. Water & sewage works . wo-coursework with armor plate joint protection,bids varied from $ to $ per squareyard; two-course with armor plate jointprotection and wire mesh reinforcement,from $ to $ per square yard; two-course work without armor plate jointprotection, but using wire mesh reinforce-ment, $ to $ per square yard. Itwill be noted that it was decided to usethe highest class of construction usingthe two-course reinforced concrete typeand all joints protected with steel plates. The township of DeKalb. 111., construct-ed a short piece of reinforced concreteroadwa
. Water & sewage works . wo-coursework with armor plate joint protection,bids varied from $ to $ per squareyard; two-course with armor plate jointprotection and wire mesh reinforcement,from $ to $ per square yard; two-course work without armor plate jointprotection, but using wire mesh reinforce-ment, $ to $ per square yard. Itwill be noted that it was decided to usethe highest class of construction usingthe two-course reinforced concrete typeand all joints protected with steel plates. The township of DeKalb. 111., construct-ed a short piece of reinforced concreteroadway pavement in 1912, the work be-ing done under the supervision of A. , state engineer. The pavementconsists of one-course work, laid O-jinches thick, the concrete mixture being1. 2 ani 3. Expansion joints were con-structed across the pavement every 50feet and protected by the Baker steel ar-mor plate. M&lleib!e IronBucket^;witK \ese 6teel TeetK Ley Steel BueKed cKrii^ Notor or E^xgrnetotally er\closcd. Wagon Loaders for Handling Sand,Stone and Gravel In the Stone Age men who had need ofa quantity of sand or stone, went to thenearest source of supply, filled a sack orskin by Ijand, slung it on their shoulders 1. LINK-BELT portable loading machine for raisingmaterials to uagons and cars. and walked back with it. Later some in-ventive genius constructed wagons orcarts, and the more or less round wheelswere probably looked upon as the lastword in mechanical invention. After awhile a shovel for loading carts was in-vented, and this combination of carryingin carts and loading by shovels has beenin universal use ever since. Railroadcars are carts adapted to long hauls, andautomobile trucks have somewhat re-placed horse-drawn vehicles, but the load-ing of these, except in very large opera-tions, is slow and done by hand the introduction of the steam shoveland the automatic grab bucket, a greatadvance in speed and economy was made,but the first cost, and diffi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
