First Lessons in Natural Philosophy for Beginners

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Eldredge & Brother, 1881 - Astronomy - 191 pages
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Page 157 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 32 - Bending a ray of light, as it passes from one substance to another of different density ; as from air to water, or from water to air.
Page 174 - Fig. 85, where F represents the fulcrum, P the power, and W the weight. A Lever of the Second Kind is one in which the weight is between the power and the fulcrum ; as in Fig.
Page 18 - How long does it take the light of the sun to reach...
Page 25 - bow " in the cloud, as a token that the world should no more be destroyed by a flood of waters.
Page 174 - Fig. 43, it is termed a lever of the third kind. 1. Many examples occur in practice of levers of the first kind. A crowbar, used to raise stones from the earth, is an instance of this sort ; so is a handspike of any kind used in the same way.
Page 43 - ... water, and warm to the hand that was in the cold water.
Page 17 - When do we see all of that part of the Moon on which the Sun shines ? When the Moon is round, and the whole of it seems to shine. What is the Moon then called ? It is called the full Moon. Why do we not always see the full Moon ? Because sometimes a part of its bright side is turned away from us.
Page 153 - ... the specific gravity of the oil is less than that of the water...
Page 20 - of the sun. When the moon is between the sun and the earth...

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