[Illustration: Fig. 10.]
I had intended at the outset of this paper to deal to some extent with
the propagation of lines of magnetism undergoing retardation in
reference to alternating current motor devices, transformers with
limited secondary current, or constant average current, an alternating
motor working with what I may term a translation lag, etc.; but it was
soon found that these matters must remain over for a continuation of
this paper at some future time. My endeavor has been in the present
paper to deal with the lines of force theory as though it were a
symbol of the reality, but I confess that it is done with many
misgivings that I may have carried it too far. Yet, if we are to use
the idea at all it has seemed but right to apply it wherever it may
throw any light on the subject or assist in our understanding of
phenomena.
* * * * *
ELECTRIC LIGHTING AT THE PARIS EXHIBITION--THE OERLIKON
WORKS.
Immediately on entering the Machinery Hall by the _galerie_ leading
from the central dome, and occupying a prominent position at the
commencement of the 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.
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