MODERN METHODS OF STREET CLEANING 



square yards; macadam, 951,787 square yards; gravel, 

 394,482 square yards; other material, 6822 square 

 yards. 



The frequency of the collections and the quantities 

 of refuse removed from the streets in 1907 are shown 

 in the following table: 



PRINCIPAL CLEANING (AT NIGHT) 



Roadways: gq Ydg 



Stone pavement: Swept six times weekly with machines .... 835,101 



Swept three times weekly with machines . . 953,989 



Swept twice weekly with machines 677,636 



Asphalt : Washed six times weekly with machines and 



rubber squeegees 227,047 



Sidewalks: Swept or washed six times weekly 1,191,364 



3,885,364 



DAY CLEANING (ACCUMULATIONS DURING DAY; 

 Roadways: Sq> Ydg 



Stone pavement: Collections four times daily 2,157,380 



Asphalt: Washed twice daily, collections continued . . 226,472 



Macadam: Collections twice daily 311,791 



Sidewalks: Swept or washed four times daily 1,511,349 



4,206,972 



Allowing seven hours working time per day or night, 

 the performance of a sweeping machine in this city 

 amounts to 8903 square yards per hour. The standard 

 machine is that made by Hentschel & Son, Berlin. 

 The principal cleaning with the sweeping machines, the 

 removal of street and house refuse, and the cleaning 

 of the sewer catch basins takes place at night. 



The principal business streets are swept six times, 



and others three times a week, with machines. Those 



which are swept with machines only three 



Frequency J 



of street times each week are cleaned with hand-brooms 

 on the remaining days. Besides this, a general 

 sweeping with hand-brooms takes place on Mondays 

 and Fridays. 



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