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.
South Shore, Chicago the 1920s generated not only a large increase in the area's population, but also greater diversity among its residents and in housing stock. Between 1920 and 1930 the population of South Shore jumped from 31,832 to 78,755. Many of these new residents were Irish, Swedish, German, or Jewish and had followed native white Protestants from Washington Park to live in South Shore's high-rises, single-family homes, and apartment houses. Institutions built in South Shore during these years reflected the community's growing diversity. By 1940 South Shore contained 15 Protestant churches, four Roman Catholic churches, and four Jewish synagogues. As African American