From The Indianapolis Star, Friday, November 21, 1919: Nineteen tons of soot is falling annually for each city block in the downtown Indianapolis area. This conclusion was arrived from calculations made by students in the night school physics class at Manual Training High School who conducted tests under the direction of their teacher Louis Karns. Using equipment similar to rain gauges that were placed on the rooftops of downtown buildings, the average sootfall collected a

From The Indianapolis Star, Thursday, September 25, 1919: Highway Transport Day will be celebrated in Indianapolis this afternoon with a parade of 200 motorized industrial trucks through the downtown district to demonstrate the vast field of activities which has been successfully taken over by gasoline powered vehicles. One hundred Indianapolis trucking concerns deliver merchandise and foodstuffs locally and overland along the thirty-six motor express routes radiating from