3 and 4. The
conductors, L1, L2, and L3 communicate with the bobbins of
three electromagnets, E1, E2, and E3, whose poles are bent at
right angles to the circumference of the wheel, R. There is never but
one pole opposite a tooth. The distance between two consecutive poles
must be equal to a multiple of the pitch increased (Fig. 3) or
diminished (Fig. 4) by one-third thereof. It will be seen upon a
simple inspection of the figures that R will revolve in the direction
of the hands of a watch when the currents follow the order L1,
L2, L3, etc., in the case shown in Fig. 3, while in the case
shown in Fig. 4 the rotary motion will be in the contrary direction
for this same order of currents. But, in both cases, and this is the
important point, the direction of rotation changes when the order in
the succession of currents; is inverted. Fig. 6 gives a perspective
view of the registering apparatus, and Fig. 5 represents it in
diagram. It will be at once seen that, the toothed wheel, r, is
reduced to its simplest expression, since it consists of two teeth
only.
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