Automatic recording McLeod gauge Patent
A United States patent for an automatic recording McLeod gauge, filed by Paul A. Faeth and issued in 1968, held in the NASA Technical Reports collection for engineers working on vacuum pressure measurement. The single drawing sheet combines wiring and relay schematics, a rectifier and transformer circuit, and a sectioned view of the mercury-filled glass gauge tube, offering line-only technical symbols, hand-lettered figure labels, and the inventor's signature block for collage or diagrammatic layouts.
