Your subject issued as an invention drawing: on Prussian-blue grid paper inside a ruled frame, construction lines fade in, white object lines draw one after another, then dimensions, numbered callouts and a title block typed letter by letter; a red pencil circles the point, adds a short note and strikes out a value to write the new one. Made for inventions, machines, how things work, structures and the history of technology.
Use this styleTell us the parts of the thing, how they connect, the key size or ratio, and the one point the viewer should notice. Give title-block facts (part names, source, year) from a reliable source. No pictures needed: everything is line drawing, monospaced labels and red-pencil notes.
A patent-style drawing of the safety pin: the coil spring, the clasp and the covered point drawn in white with a section A–A, then the red pencil strikes out "2" pieces in the title block and writes "1 wire", and circles the clasp that keeps the point covered.
Blueprint Patent · 16:9 · 10.0s