GE Project EF-140

General Electric's 1961 educational kit — three potentiometers and an earphone null, sold as an analog computer with no amplifier or integrator anywhere in it.

Analog Computers

GE Project EF-140 · Deep Dive · 1961

GE Project EF-140

General Electric's 1961 educational kit — three potentiometers and an earphone null, sold as an analog computer with no amplifier or integrator anywhere in it.

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    Volumes

    1. Vol 1 GE Project: Analog Computer EF-140 — Volume 1 — Overview & history What General Electric sold in 1961, what the kit actually contains, the EF/EE naming problem, and the single primary document the whole series rests on
    2. Vol 2 GE Project: Analog Computer EF-140 — Volume 2 — What the machine actually is Three potentiometers, a bridge, and an audible null — the circuit analysed from Fig. No. 30, including the loading question the manual never raises
    3. Vol 3 GE Project: Analog Computer EF-140 — Volume 3 — Building it The complete parts list, the no-solder connector system, the twenty-two assembly steps, the wiring schedule, and the shipping carton that becomes the cabinet
    4. Vol 4 GE Project: Analog Computer EF-140 — Volume 4 — Operating it Calibration against a known product, scale plates and memory boards, the null by ear, and the two corrections General Electric issued after publication
    5. Vol 5 GE Project: Analog Computer EF-140 — Volume 5 — The mathematics the scales carry Powers of ten, logarithmic scales, roots, trigonometric functions and reciprocals — how printed cards extend three potentiometers far beyond multiplication
    6. Vol 6 GE Project: Analog Computer EF-140 — Volume 6 — The problem set Forty-nine problems from batting averages to the Mercury-Redstone — what General Electric chose to teach, and which of the published answers survive checking
    7. Vol 7 GE Project: Analog Computer EF-140 — Volume 7 — Analog computing principles What this machine embodies, what it cannot do, why the integrator is the dividing line, and whether General Electric was entitled to the name