Browse Items (2 total) Browse All Browse by Tag Search Items Tags: Drawing Sort by: Title Creator Date Added Kirchin004 Stone abrasion machine. Slide label reads: "50-100 gram pieces are given 10,000 revolutions in this mach." Tags: Abrasion Machine, Drawing Kirchin003 This is a drawing of a testing machine. Tags: Drawing, Testing Machine Output Formats atom, dcmes-xml, json, omeka-xml, rss2