Excerpt from Mechanical Drawing: Written for the Use of the Naval Cadets at the United States Naval Academy
Triangular-scale Guard Right-line Pen Use of the R. L. Pen To Examine and Test the R. L. Pen To Sharpen the R. L. Pen Compasses To Test the Compasses To Use the Compasses Extension-bar Bow Spacers.
Bow Pencil and Bow Pen Dividers To Use the Dividers Irregular Curves.
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