article · German
Rechenanlage "Verograph" zur genauen, laufenden Distanzbestimmung — Früher elektrischer Analog-Rechner
A 28-page technical-historical study (December 2018) by André Masson examining the Contraves AG "Verograph" system, an early electrical analog computer developed from ~1936 for continuous real-time aircraft range determination using two theodolites spaced 1–2 km apart and resistance-network computing elements operating at 75 Hz AC. The article reconstructs the sine-rule geometry, the two-stage coordinate transformation that reduces uniform precision errors across the sky, and the Wheatstone-bridge-based resistance-selector technique used in place of amplifier tubes. The companion "Stereomat" device (same technology, post-hoc 3-D shell-burst error computation) is also introduced, and Fritz Fischer's role as Contraves founder and chief inventor is documented.