MODERN METHODS OF STREET CLEANING 



whenever they seem needed in order to cany away 

 accumulations of dirt. 



The refuse collected from the principal streets during 



the day is put into pits having a capacity of 2.6 cubic 



yards placed beneath the sidewalk. There 



Underground 



pits for were, in 1907, 190 of these temporary storage- 

 bins. The pits are emptied at night, washed 

 out and disinfected. Each street in the city is cleaned 

 at least once a week at night and twice a week in the 

 day. Owing to their importance, many streets are 

 cleaned nightly during the week and four times each 

 day. On an average about one-fifth of the total street 

 area is cleaned by the night-cleaning force once a day 

 and the rest from once to twice a week. In addition 

 the coarse refuse is removed by hand from two to four 

 times per week. 



The asphalted streets receive special care. To keep 



them looking well in the daytime the main streets are 



divided into posts, each about 650 to 3250 feet 



Orderhes * l n g> gi ym g an area f r 6acn man * k ee P clean 



of 2160 to 15,600 square yards. At present 

 there are forty-nine posts for about 266,000 square yards 

 of asphalt. On Sundays and week days from 6 in the 

 morning until 7 in the evening the men at these posts 

 have to remove the visible refuse and sand the streets 

 after they are sprinkled. 



The sand used upon the streets is, in reality, hard 

 gravel composed of particles as large as three-fourths of 



an inch in diameter. It is kept under the 



The Sand 



used on the pavement in special pits holding 2.6 cubic yards 

 each. At the present time there are 21 such 

 compartments. 

 The asphalt is thoroughly flushed at night by hose 



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