Ruling pen attachment from a drafting tool kit used by John S. Chase

Source catalog description

This description refers to material held by Smithsonian National Museum of African American History and Culture. Visual details below describe the original material.

Ruling pen attachment from a drafting tool kit used by architect John S. Chase. The small metal attachment has two (2) metal prongs with a screw in the center to adjust the width of the opening. The screw is engraved with [RIDGWAY'S GERMANY]. The prongs are tapered at the end. The other end is forked to fit into a ruling pen handle.

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