Journal - Franklin Institute of the State of Pennsylvania
A long-running technical periodical issued by the Franklin Institute in Philadelphia from 1826 onward, carrying papers on science, engineering, meteorology and patent reports for engineers, inventors and manufacturers. The plates run to line-engraved engine indicator diagrams with annotated pressure figures and hyperbola curves, machine and piping schematics in plan, and hatched shading on cut sections \u2014 useful as ready-made technical line work, numeric labelling and measured-drawing motifs.
