Scope and Contents The Harold Palmer Mobile Unit Collection consists of materials documenting the development and use of the Iowa State Teachers College Mobile Industrial Arts Unit. The unit, originally a 44-foot bread truck and trailer, was designed to help instructors teach industrial arts to rural students whose schools could not afford their own equipment. Among the machines included in the unit were lathes, drill presses, a milling machine, and a metal shaper. Fifth through eighth grade students learned...