Swiss section, is a very important plant of
dynamos, motors, and steam engines, put down by the Oerlikon Works, of
Zurich. During the time the machinery is kept running in the hall,
power is supplied electrically to drive the whole of the main shafting
in the Swiss section and part of that in the Belgian section,
amounting in all to some 200 ft., a large number of machines of
various industries deriving their power from these lines of shafting,
while during the evening a portion of the upper and lower galleries
adjoining this section is lit by some twenty-five arc lamps run from
this exhibit. Steam is supplied from the Roser boilers in the motive
power court. The whole of the generating plant is illustrated in one
view, and a separate view is given of the motor employed to drive the
main shafting, this latter view showing the details of connection to
the same. On the extreme right hand side of the first view is a direct
coupled engine and dynamo of 20 horse power, a separate cut of which
is given in Fig. 3. The engine is of the vertical single cylinder
type, standing 5 ft. high, and fitted, as are the other two engines
exhibited, with centrifugal governor gear on the fly wheel, acting
directly on the throw of the cutoff valve eccentric. The two
standards, supporting the cylinder and forming the guide bars,
together with the entire field magnets and pole pieces of the dynamo,
and the bed plate common to both, are cast in one piece.

[Illustration: FIG. 3 ENGINE AND DYNAMO FOR STEAMSHIPS.]

The machine is specially designed for ship lighting, and with the view
of preventing any magnetic effect upon the ship's compass, the field
is arranged so that the armature, pole pieces, and coils are entirely
inclosed by iron. Any tendency to leakage of magnetic lines will
therefore be within the machine, the iron acting as a shield. This
build of field--shown in Fig. 3A--is also advantageous as a mechanical
shield to the parts of the machine most likely to suffer from rough
handling in transport, and it will be seen that the field coils are
easily slipped on before the armature is mounted in its bearings.

[Illustration: FIG. 3A]

The winding is compound, and in such a direction that the two opposite
horizontal poles have the same polarity; it follows from this that
there will be two consequent poles in the iron, these being opposite
in name to the horizontal poles and at right angles to them, viz.,
above and below the armature.