Development of a Microprocessor-Based Instrument for Static Testing Small Rocket Engines
A 1979 Naval Postgraduate School thesis by Arthur Houghton Barber III, distributed through the Defense Technical Information Center, on building a portable microprocessor instrument for static tests of small solid-propellant rocket engines. The pictures are plain line schematics of op-amp amplifier, filter, and peak-detector circuits, digital interface and A/D converter wiring, and a thrust transducer strain-gauge bridge, drawn in black ink on white paper with reference designators and component values. A designer could borrow their clean, technical grid-and-symbol style for diagrams or infographic line work.
