Machine shop at the Portland Company in Portland, Maine with employees, and equipment ca. 1890. "This is a great view of the interior of one of the machine shops for working on smaller parts. Note the overhead open shafting and drive belts, with no safety guards, powering each machine from a single industrial steam engine power source." - Fletcher, David H. 'The Portland Company 1846-1982. Charleston, S.C. : Arcadia Pub., 2002. 14.