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The Mirror of Literature, Amusement, and Instruction - Volume 17, No. 487, April 30, 1831 by Various
page 18 of 51 (35%)
already published are an earnest of the Editor's zeal and success. The
best method of illustrating this recommendation, is to seize from the
volume a few familiar effects whose causes are imperfectly understood, and
thus to show how closely the spread of science is identified with
civilization and the common comforts of social life:--

_Deceptive appearance of Waves_

If we observe the waves continually approaching the shore, we must be
convinced that this apparent motion is not one in which the water has any
share: for were it so, the waters of the sea would soon be heaped upon the
shores, and would inundate the adjacent country; but so far from the
waters partaking of the apparent motion of the waves in approaching the
shore, this motion of the waves continues, even when the waters are
retiring. If we observe a flat strand when the tide is ebbing, we shall
still find the waves moving towards the shore.

_Ornamental Fountain Clocks._

It is the same cause (that which produces the deceptive appearance of a
progressive motion in the waves of the sea) which makes a revolving
cork-screw, held in a fixed position, seem to be advancing in that
direction in which it would actually advance if the worm were passing
through a cork. That point which is nearest to the eye, and which
corresponds to the crest of the wave in the former example, continually
occupies a different point of the worm, and continually advances towards
its extremity.--This property has lately been prettily applied in
ornamental clocks. A piece of glass, twisted so that its surface acquires
a ridge in the form of a screw, is inserted in the mouth of some figure
designed to represent a fountain. One end of the glass is attached to the
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