Photo by David Friend Productions, San Diego, California
MAGNETIC DEFLECTION CROOKES' DEMONSTRATION TUBE
10-033. German, 2nd quarter 20th century, unsigned but probably retailed in the US by CENCO or The Chicago Apparatus Co. Described on page 168 in the 1936 Chicago Apparatus Co. catalog as follows:
"For showing that cathode rays are deflected by a magnetic or electric field. When a high potential is impressed across the terminals, a stream of cathode rays is established which mush pass through a narrow slit in a metal plate mounted directly in front of the chathode. This narrow stream of rays traces a luminous flourescent streak on a mineral coated screen.
Cathode rays normally travel in a straight line but are deflected through an arc when passing through a magnetic or electric field, the direction of the curvature depending on the polarity of the field with respect to the direction taken by the rays. This effect is strikingly illustrated on the screen as a magnet or current carrying helix approaches the tube."
