A detail of a battery terminal casting in the process of being filed. Aside from the work space, storage and cleaning areas can also be seen at the Proof Machine & Brass Foundry. Employee of Proof Machine & Brass Foundry melts brass for use in battery terminal construction. Proof Machine & Brass Foundry was a non-ferrous foundry making brass battery terminals located at 936 East 72nd Street in Cleveland, Ohio. Proof Machine & Brass Foundry was a division of Clark Cable Corporation.