Philosophical Conversations: Or, A New System of Physics, by Way of Dialogue, Volume 2

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W. Innys, 1731 - Science
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Page 376 - If light consisted only in pression propagated without actual motion, it would not be able to agitate and heat the bodies which refract and reflect it. If it consisted in motion propagated to all distances in an instant, it would require an infinite force every moment, in every shining particle, to generate that motion. And if it consisted in pression or motion, propagated either in an instant or in time, it would bend into the shadow. For...
Page 48 - Iron dissolves the Filings with a great Heat and Ebullition, is not this Heat and Ebullition effected by a violent Motion of the Parts, and does not that Motion argue that the acid Parts of the Liquor rush...
Page 340 - When a Man in the dark presses either corner of his Eye with his Finger, and turns his Eye away from his Finger, he will see a Circle of Colours like those in the Feather of a Peacock's Tail. If the Eye and the Finger remain quiet these Colours vanish in a second Minute of Time, but if the Finger be moved with a quavering Motion they appear again.
Page 341 - And when a Coal of Fire moved nimbly in the circumference of a Circle, makes the whole circumference appear like a Circle of Fire; is it not because the Motions excited in the bottom of the Eye by the Rays of Light are of a lasting nature, and continue till the Coal of Fire in going round returns to its former place? And considering the lastingness of the Motions excited in the bottom of the Eye by Light, are they not of a vibrating nature?
Page 69 - Pafte, acts upon the Iron, and in five or fix Hours grows too hot to be touched, and emits a Flame. And by thefe Experiments compared with the great quantity of Sulphur with which the Earth abounds, and the Warmth of the...
Page 94 - Pofition, and that it would be always high Water under the Poles, and low Water every where under the Equinoctial :. and therefore the nearer the Moon approaches the Poles, the lefs...
Page 93 - Quarters, are occafioned by the attractive Force of the Sun in the new and full, confpiring with the Attraction of the Moon, and producing a Tide by their united Forces: whereas in the Quarters, the Sun raifes the Water where the Moon deprefles it, and the contrary ; fo as the Tides are made only by the difference of their Attractions.
Page 48 - Water, so as to make it as saline at the top as at the bottom. And does not this imply that the Parts of the Salt or Vitriol recede from one another, and endeavour to expand themselves, and get as far asunder as the quantity of Water in which they float, will allow?
Page 377 - ... straight ones. But light is never known to follow crooked passages nor to bend into the shadow. For the fixed stars, by the interposition of any of the planets, cease to be seen. And so do the parts of the sun, by the interposition of the moon, Mercury, or Venus. The rays which pass very near to the edges of any body, are bent a little by the action of the body...
Page 93 - Particulars that have been obferv'd about them $ fo that there can be no room left to doubt, but that this is the true caufe thereof. The Spring Tides upon the New and Full Moons, and...

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