A FEW SCHEMATIC DRAWINGS FROM THE GOOD OLD DAYS OF HARD WORK.

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John Herschel created the blueprint process in 1842.
GLOB MILLS BLUEPRINT, CIRCA 1899.
More donated vintage blueprints of hydro turbines.
PMC blueprint history.
PMC blueprint history.
Historical notes on the Woodward compensating type water wheel governor.
PMC blueprint history.
PMC blueprint history.
WOODWARD GATE SHAFT OIL PRESSURE GOVERNOR HISTORY.
WOODWARD GATE SHAFT OIL PRESSURE GOVERNOR HISTORY.
Woodward Oil Pressure Relay Valve Water Wheel Governor history.
ELMER WOODWARD'S NEW TYPE OF OIL PRESSURE WATER WHEEL GOVERNOR '' GATESHAFT'' TYPE.
PMC blueprint history.
PMC blueprint history.
PMC blueprint history.

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