Shore durometer The basic test requires applying the force in a consistent manner, without shock, and measuring the hardness (depth of the indentation). If a timed hardness is desired, force is applied for the required time and then read. The material under test should be a minimum of 6 mm (0.25 inches) thick. The ASTM D2240 standard recognizes twelve different durometer scales using combinations of specific spring forces and indentor configurations. These scales are properly referred to as durometer types; i.e., a durometer type is specifically designed to determine a specific scale, and the scale does not exist separately from the durometer.
Chicago North Shore and Milwaukee Railroad Chicago North Shore and Milwaukee Railroad The Chicago North Shore and Milwaukee Railroad, also known as the North Shore Line, was an interurban that operated between the Chicago Loop and downtown Milwaukee. The 85-mile route of the North Shore Line utilized a combination of private rights-of-way and street running as well as trackage rights over the Chicago "L" network. In addition to operating passenger and freight trains, the company also provided streetcar and motor bus services throughout its history. Originating in 1895 as an electric street railway in the city of Waukegan, the property was gradually transformed into what author