Also one of the
switches in connection with the central switch, S2, is connected to
the same motor, and therefore the latter may be run by either machine,
or, in fact, any combination of machines, lamps, and motor be made as
required.
The form of switch made by the Oerlikon Works is illustrated in Fig.
7. Two thick semicircular bands of copper are screwed at one end to
opposite sides of a square block which is turned round by the switch
handle. The block has a projection at each corner, and two strong,
flat, stationary springs are attached to the framework of the switch
and press on opposite sides of the block. The ends of the springs
engage in the projections and prevent the switch being turned round
the wrong way, while the pressure of the springs on opposite sides
forces the copper bands to take up a position exactly in line with the
terminal contacts when the switch is closed, or at right angles to
them when it is opened.
[Illustration: FIG. 4A]
[Illustration: FIGS. 4, 4B and 4C]
Further, each lamp has its own separate adjustable resistance, fuse,
and switch. These are of special construction, combined in one, and
are illustrated in Figs. 4 and 4A; the other figures, 4B and 4C,
showing some of the details of the same. The wires, W W, lead from and
to one lamp. The current enters at one wire, passes through the fuse,
f--Figs.
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