MODERN METHODS OF STREET CLEANING 



Finally, it remains to describe a new piece of appara- 

 tus which both sweeps and scrapes the streets. This 

 Machine machine is especially intended to clean smooth 

 Errand pavements like asphalt and wood. It is 

 scraper composed of an ordinary cylindrical sweeper 

 behind which is a frame provided at its extreme rear 

 with a bearing wheel and with a rubber scraper between 

 this wheel and the brush. The scraping edge is in three 

 parts. It is intended to remove such dirt as may be 

 left by the broom and leave the street in the same 

 condition as when cleaned by hand labor. The ma- 

 chinery controlling the scraper is independent of that 

 controlling the broom, a feature which permits of the 

 same apparatus being used to cleanse different kinds 

 of pavements. It should be noted that the refuse 

 dealt with by this machine is, for the most part, of 

 the consistency of soft mud. 



Experiments have been made with automobile sweep- 

 ers and sprinklers. The machines were of 15 H.P. 

 and driven by gasoline. One gallon of gaso- 



Motors ,. . 



line was capable ol driving the machine 

 about four miles. The broom was about 7 feet long 

 and was placed under the frame of the machine and 

 between the forward and rear wheels. It was capable 

 of sweeping 120,000 square yards per day as compared 

 with 42,000 square yards swept by a horse-drawn ma- 

 chine broom. It cost about $8.11 per day to operate 

 the machine as a broom and $6.13 as a sprinkler, includ- 

 ing operating and interest charges. To use the machine 

 as a sprinkler and sweeper cost $7.12 per day as against 

 $7.76 for sprinkling and sweeping by horse-propelled 

 machines. 



The sprinkling of streets is accomplished by means 



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