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Photographer: Keith L
Taken: June 12, 2011
Caption: How Granitoid Was Made
Additional Description: From Patent No. 856,105, issued June 4, 1907:
"Be it known that we, William J. Sinek and Rudolph S. Blome, citizens of the United States, residing at Chicago, have invented certain new and useful improvements in Pavements and Methods of Making the Same..."
Step 1: Roadway excavated.
Step 2: Macadam foundation laid - crushed rock, cinders, or gravel, compressed to form a smooth, hard surface.
Step 3: Concrete gutter/curb poured.
Step 4: Five-inch-thick base course of concrete laid.
Step 5: Wearing surface added - a composition of cement and crushed granite. In Duluth, a hard black stone called gabbro, found locally, was used, instead of Granite.
"Before the facing has hardened, it is grooved or scored to provide footholds for the horses' shoes... We also brush it crosswise with a bristle brush to slightly scratch its surface so that it will not be too smooth or slippery."
Submitted: July 3, 2011, by Keith L of Wisconsin Rapids, Wisconsin.
Database Locator Identification Number: p160061
File Size: 2.550 Megabytes
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