If ten thousand men were hired
to act simultaneously, it would be exceedingly difficult to
discover whether each exerted his whole force, and consequently,
to be assured that each man did the duty for which he was paid.
And if still larger bodies of men or animals were necessary, not
only would the difficulty of directing them become greater, but
the expense would increase from the necessity of transporting
food for their subsistence.
The difficulty of enabling a large number of men to exert
their force at the same instant of time has been almost obviated
by the use of sound. The whistle of the boatswain performs this
service on board ships; and in removing, by manual force, the
vast mass of granite, weighing above 1,400 tons, on which the
equestrian figure of Peter the Great is placed at St Petersburgh,
a drummer was always stationed on its summit to give the signal
for the united efforts of the workmen.
An ancient Egyptian drawing was discovered a few years since,
by Champollion, in which a multitude of men appeared harnessed to
a huge block of stone, on the top of which stood a single
individual with his hands raised above his head, apparently in
the act of clapping them, for the purpose of insuring the
exertion of their combined force at the same moment of time.
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