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Updated: May 7, 2025
Under his right and left hands were the double-series potentiometers actuating the variable-speed drives of the flight-angle directors in the hour and declination ranges; before his eyes was the finely marked micrometer screen upon which the guiding goniometer threw its needle-point of light; powerful optical systems of prisms and lenses revealed to his sight the director-angles, down to fractional seconds of arc.
For almost an hour Breckenridge sat motionless, his eyes flashing from micrometer screen to signal panel, his sensitive fingers moving the potentiometers through minute arcs because of what he saw upon the screen and in instantaneous response to the flashing, multi-colored lights and tinkling signals of his board.
Seaton asked of the First of Mechanism, who had lifted himself up into the projector. "Very little. This motor governs the hour motion, that one the right ascension. The potentiometers regulate the degree of vernier action any ratio is possible, from direct drive up to more than a hundred million complete revolutions of that graduated dial to give you one second of arc." "Plenty fine, I'd say.
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