A PLAN VIEW OF THE CAMPYLOGRAPH. … perspective view, the pen will repeat over the samepath. By loosening the fixing screw, the rod can bemoved endwise and again fixed, so that the pen willdescribe a parallel figure. A spiral character can begiven to any curve by the appliance which is shown at-tached in the top plan view and…
Ohio · Patents · Wheel · Apparatus · Radium · Scientific American · Gas · Superimposed track · Sewing machine · Horse power · Red cedar · Rapid transit · White spot · American august · Blue book · Ohio valley
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