Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . 0 \ o / » <3 •* S 6 7 8 S /o // /a /3 /4 /S /6 /7 /9 /S //fOA Stree/jr t^/THoif/Co//./rre^ rfeqn 605040JO20/OO / g J 4 S 6 7 8 S /O f/ /i /3 /4 /5 /S /7 /a /9 1 Diagram 3 in a good state of repair and throughout the greater part of theirlength these streets were covered with a smooth surfaced mate-rial, such as asphalt, bitulithic or wood block pavement. The con-trolling factor in such cases is the rapid motion of car traf^c overthe streets. Unless the pavement between and close to the railsis
Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . 0 \ o / » <3 •* S 6 7 8 S /o // /a /3 /4 /S /6 /7 /9 /S //fOA Stree/jr t^/THoif/Co//./rre^ rfeqn 605040JO20/OO / g J 4 S 6 7 8 S /O f/ /i /3 /4 /5 /S /7 /a /9 1 Diagram 3 in a good state of repair and throughout the greater part of theirlength these streets were covered with a smooth surfaced mate-rial, such as asphalt, bitulithic or wood block pavement. The con-trolling factor in such cases is the rapid motion of car traf^c overthe streets. Unless the pavement between and close to the railsis kept clean a cloud of dust is raised with the passage of eachcar. The height and extent to which this cloud is scattered canbe seen very well at night near street lights where a dark ground STUDIES IN AIR CLEANLINESS 221 illumination occurs. The material scattered about consists oforganic debris, gritty siliceous material and metallic dust from rails,wheels and brake shoes. All streets over which surface cars areoperated should receive special attention from the street cleaningdepartment. If they do not the streets not only lose in attractive-ness for business and residence purposes, but th
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Keywords: ., bookcentury1800, bookdecade1890, bookidtransactions, bookyear1895
