Plus I can read 'blueprints'(1). As I 'kinda' did that for a living -- 1st as a Draftsman & then into Mechanical Engineering(2). So the drawing makes perfect sense Engineering wise]
(1) Generic Term for Architectural and Engineering Drawings and their copies.
(2) I picked up my 1st Drafting Pencil and put Lead to Paper in Sept of 1963 as a Sophomore in HS.(dang I'm gettin old.)