g stations and plants, as they employ on the average over
250,000 persons, whose annual compensation amounts to not less than
$155,000,000.

In the manufacture of about $50,000,000 worth of dynamos and motors
annually, for central-station equipment, isolated plants, electric
railways, and other purposes, the manufacturers of the country employ an
average of not less than 30,000 people, whose yearly pay-roll amounts to
no less a sum than $20,000,000.

The growth of the telephone systems of the United States also furnishes
us with statistics of an analogous nature, for we find that the average
number of employees engaged in this industry is at least 140,000, whose
annual earnings aggregate a minimum of $75,000,000; besides which the
manufacturers of telephone apparatus employ over 12,000 persons, to whom
is paid annually about $5,500,000.

No attempt is made to include figures of collateral industries,
such, for instance, as copper, which is very closely allied with the
electrical arts, and the great bulk of which is refined electrically.

The 8000 or so motion-picture theatres of the country employ no fewer
than 40,000 people, whose aggregate annual income amounts to not less
than $37,000,000.

Coming now to the Orange Valley plant, we take a drop from these figures
to the comparatively modest ones which give us an average of 3600
employees and calling for an annual pay-roll of about $2,250,000. It
must be remembered, however, that the sums mentioned above represent
industries operated by great aggregations of capital, while the Orange
Valley plant, as well as the Edison Portland Cement Company, with an
average daily number of 530 employees and over $400,000 annual pay-roll,
represent in a large measure industries that are more in the nature
of closely held enterprises and practically under the direction of one
mind.

The table herewith given summarizes the figures that have just been
presented, and affords an idea of the totals affected by the genius
of this one man. It is well known that many other men and many other
inventions have been needed for the perfection of these arts; but it
is equally true that, as already noted, some of these industries are
directly the creation of Edison, while in every one of the rest his
impress has been deep and significant. Before he began inventing, only
two of them were known at all as arts--telegraphy and the manufacture
of cement. Moreover, these figures deal only with the U