The Scientific Class-book; Or, A Familiar Introduction to the Principles of Physical Science ... on the Basis of J.M. Moffat, 第 1 篇E.C. Biddle, 1836 |
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action air-pump angle aperture apparatus appear applied ascertained atmosphere atmospheric pressure attraction ball become body cause centre of gravity centrifugal force circumstances colours common compressed concave construction convex convex lens cylinder degree density depend described diameter direction distance earth effect elastic electricity equal exhibited experiments Fahrenheit fall feet figure fluid force friction gases glass glottis heat Hence hydrostatic pressure inches inclined plane instrument latter length lens lenses lever light liquid machine magnetic manner mass means mercury metal mirror motion moving Natural Philosophy nature object observed pass peculiar pendulum phenomena philosophers piston plane plate pole pounds pressure principle produced proportion pyrometer quantity rays reflected refraction relative retina screw side solid sound space specific gravity string substances supposed surface takes place temperature thermometer tion tone tube valve velocity vertical vessel vibrations voltaic pile weight wheel wire zinc
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第 28 頁 - Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
第 63 頁 - For since the time of vibration is to the time of descent through half the length of the pendulum, as the circumference of a circle to its diameter...
第 429 頁 - ... of the whole quantity of matter in the earth. But the attraction of a quantity of matter at the earth's centre would be more powerful on a body at the bottom of a mine than on one at the top, in the inverse ratio of the squares of the distances...
第 454 頁 - They have subsequently constructed another, which will sustain 2063 pounds. It consists of a bar of soft iron, bent into the form of a horse-shoe, and wound with twenty-six strands of copper bell-wire, covered with cotton threads, each thirty-one feet long; about eighteen inches of the ends are left projecting, so that only, twenty-eight feet of each actually surround the iron. The aggregate length of the coils is therefore 728 feet. Each...
第 362 頁 - At the extremity of the vast shadow which Etna projects across the island, appeared a perfect and distinct image of the mountain itself, elevated above the horizon, and diminished as if viewed in a concave mirror. Where or what the reflector could be which exhibited this image, I cannot conceive : we could not be mistaken in its appearance, for all our party observed it, and we had been prepared for it beforehand by our Catanian friends. It remained visible about ten minutes, and disappeared as the...
第 439 頁 - Thus, in a battery composed of zinc, diluted sulphuric acid, and copper, the acid acts upon the zinc, and not on the copper. The galvanic fluid proceed, therefore, from the zinc to the acid, from the acid to the copper, &c.