A Telegraph-Sounder Engine
By Howard Rollo
The following article explains how to make a simple electric engine
from a telegraph sounder, a steel rod and a few pieces of wood:
The wooden part consists of a base of 3 x 4 inches and upright 5 x
1 inches mounted at one end of the base, with a bracket 3 x 1
inches to hold the, upper bearing screw. Mount the magnets and yoke
on the base and make a slight indentation with a drill or center
punch in the exact center if the yoke to form a bearing for the
The shaft Consists of a mechanical toy rod about 4 inches long.
File each end to a point and also file two flat surfaces on
opposite sides of the rod, about 1 inch from the upper end. The
iron armature should just clear the top of the magnets, and is
fastened to the rod with solder or friction only. The brush is
formed from a piece of copper wire fastened to the upright and bent
around to touch the flat surfaces on the rod. It should make
contact twice in every revolution. It should be adjusted so that
contact is made when the armature is farthest away from the magnets
and broken when the armature is over the magnets. This engine will
run at a very high speed with one dry cell.
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