Journal - Franklin Institute of the State of Pennsylvania
The Journal of the Franklin Institute, a technical and scientific periodical issued in Philadelphia from 1826 for engineers, inventors, and readers tracking patents, mechanics, and meteorology. Its wood-engraved figures show electrical apparatus in plain outline and hatched cross-section \u2014 telephone receivers, coils and electromagnets, battery jars, wiring runs labelled with single letters \u2014 useful as small mechanical spot illustrations and lettered diagram parts.
