Wells's Natural Philosophy: For the Use of Schools, Academies, and Private Students: Introducing the Latest Results of Scientific Discovery and Research; Arranged with Special Reference to the Practical Application of Physical Science to the Arts and the Experiences of Every-day Life. With Three Hundred and Seventy-five Engravings

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Ivison & Phinney, 1859 - 452 sider
 

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Side 123 - All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.
Side 72 - The disciples of Plato contributed not a little to the advancement of optics, by the important discovery they made, that light emits itself in straight lines, and that the angle of incidence is always equal to the angle of reflection. Plato terms colours " the effect of light transmitted from bodies, the small particles of which were adapted to the organ of sight.
Side 316 - The quotient found by dividing the sine of the angle of incidence by the sine of the angle of refraction, is called the index of refraction.
Side 202 - A degree of deafness ensues when this tube is obstructed, as in a cold ; and a crack, or sudden noise, with immediate return of natural hearing, is generally experienced when, in the effort of sneezing or otherwise, the obstruction is removed.
Side 119 - Whatever rude structure the climate and materials of any country have obliged its early inhabitants to adopt for their temporary shelter, the same structure, with all its prominent features, has been afterwards kept up by their refined, and opulent posterity. Thus, the Egyptian style of building...
Side 58 - ... the pendulum always moves faster in proportion as its journey is longer, is, that in proportion as the arc described is more extended, the steeper are the declivities through which it falls, and the more its motion is accelerated.
Side 220 - No eider-down In the cradle of an infant is tucked in more kindly than the sleeping-dress of winter about the feeble flower-life of the Arctic regions.

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