Blueprint

A cyanotype sheet: Prussian-blue paper, a faint grid, a printed border and title block, off-white technical-pen lines. The part is drafted the way a draughtsman works — centre lines, then light construction lines that overshoot their corners, then the ink over them — projected into a second view with its hidden edges dashed. The dimensions come last, in small drafting lettering, then a slow push-in to the detail. Pencil and pen sound on every stroke.