Where do you get India ink these days? The death of manual drafting rendered it pretty obsolete.
Remember bow pens, dividers, rapidographs, drafting boards and T-squares. Circle templates, lettering guides, triangles and pounce powder. Scaling rulers, drafting pencils and rotary sharpeners. Power erasers, dusting brush, slide rule and velum. For the pro, a drafting head with degree angle adjustments on a parallelogram arm. Probably forgotten a few items lost in the mists of time. It was actually a pleasant form of art.