same is the case with all the rest of the winding.

[Illustration: FIG. 1. PERSPECTIVE VIEW OF THE THURY MACHINE.]

In this way the cylinder becomes inclosed within nine rectangular wire
frames, each of which is connected with the following one by a conductor
that is at the same time connected with one of the nine plates of
the collector. The number of the rubbers corresponds to that of the
inducting poles. They may be coupled in different ways, but they are in
most cases united for quantity.

It will be seen that the Thury armature resembles, in the system of
winding, those of the Siemens machines and their derivatives. But it
differs from these, however, in the details connected with the coupling
of the wires, from the very fact that the features of a two-pole machine
are not found exactly in a multipolar one.

[Illustration: FIGS. 2 AND 3.]

This latter kind of machine is considered advantageous by its inventors,
in that there is no need of revolving it with much velocity. It must not
be forgotten, however, that although we reduce the velocity by this mode
of construction, we are, on another hand, obliged to increase the size
of the machine, so that, according to the circumstances under which we
chanced to be placed, the advantage may now be on the one side and now
on the other.

[Illustration: FIGS. 4 AND 5.]

It goes without saying that Fig. 4 is essentially diagrammatic, and is