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considerably until the centre of the storm reached her. The fury of
the winds was hushed, and a calm of half- an-hour's duration
ensued, arising from the establishment of an equilibrium of forces,
the winds blowing with equal intensity inward from all sides. The
wind then sprang up with increased violence, but from the opposite
N.w. direction, and, after enduring for a period, the force of the
wind abated, and the storm passed away. The advantages resulting
from a knowledge of this law of storms, have been exceedingly
great, as, by attending to certain indications, the mariner is
enabled to ascertain his position relative to the centre of the
storm, and to adopt the course which will most readily bear him
beyond its influence. The tendency of all matter, whether solid or
fluid, to assume when disturbed a series of alternating movements,
known by the terms vibrations, undulations, leaves, or
oscillations, might have claimed our attention in this chapter; but
it is thought advisable, for the purpose of avoiding repetition, to
reserve the consideration of these important forms of motion, until
the laws of the propagation of motion in fluid bodies, and the
phenomena of sound, light, and heat, come to be considered. Before
this portion of our subject is closed, it becomes, however,
necessary to examine an hypothesis, which is sanctioned by the
authority of some of the most talented philosophers of the present
age. In explaining the phenomena which attend the production and
transmission of sound, the development and the propagation of light
and heat, thepassage of electricity, and the varying modes of
chemical affinity, they have stated that all those forms of force
could be referred to motion, and that their development depended
upon the character of the motion in action. Thus, a...
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