article · German
Anwendung der Braunschen Röhre für die Auflösung von Differentialgleichungen auf elektrischem Wege
A three-page German journal article (Archiv für Elektrotechnik, Vol. XXXIII, 1939) by Hans Kleinwächter describing an early analog-computing technique in which a specially constructed Braun tube (CRT) with a resistance-rod collector and inductance-coil differentiator solves ordinary differential equations electrically. The beam position encodes the dependent variable y, an inductance in the anode circuit of an auxiliary tube produces y′, and the Wehnelt-cylinder/deflection arrangement multiplies two variables; circuit schematics for first- and second-order equations are provided and the method is generalized to nth-order cases.
cathode ray tube analog computationdifferential equationselectronic analog circuitinductance integrator