The Boston School Compendium of Natural and Experimental Philosophy: Embracing the Elementary Principles of Mechanics, Hydrostatics, Hydraulics ... with a Description of the Steam and Locomotive Engines

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Marsh, Capen, Lyon & Webb, 1839 - Astronomy - 213 pages
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Page 176 - Venus a pea, on a circle 284 feet in diameter; the Earth also a pea, on a circle of 430 feet; Mars a rather large pin's head, on a circle of 654 feet; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small...
Page 109 - ... 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 99 - It can engrave a seal, and crush masses of obdurate metal before it ; draw out, without breaking, a thread as fine as gossamer, and lift a ship of war like a bauble in the air. It can embroider muslin and forge anchors, cut steel into ribbons, and impel loaded vessels against the fury of the winds and waves.
Page 22 - A Circle is a plane figure bounded by a curved line called a circumference, every point of which is equally distant from a point within called the centre.
Page 177 - ... they have a certain convenience ; but as they are otherwise entirely arbitrary, and correspond to no natural subdivisions or groupings of the stars, astronomers treat them lightly, or altogether disregard them, except for briefly naming remarkable stars, as 'Alpha Leonis,' ' Beta Scorpil,' &c., by letters of the Greek alphabet attached to them.
Page 171 - Each strand is wound on a little less than an inch : in the middle of the horse-shoe it forms three thicknesses of wire ; and on the ends, or near the poles, it is wound so as to form six thicknesses.
Page 134 - This is proved by the following considerations. First, A rainbow is never seen except when rain is falling, and the sun shining at the same time ; and that the sun and the bow are always in opposite parts of the heavens ; and, secondly, that the same appearance may be produced artificially, by...
Page 83 - This kind of weather occurs most frequently in the torrid zone, where the heat is greatest. The air, being more rarefied there than in any...
Page 58 - The philosopher labored at the problem m vain, till going one day into the bath, he perceived that the water rose in the bath in proportion to the bulk of his body. He instantly perceived that any other substance of equal size would raise the water just as much, though one of equal weight and less bulk could not produce the same effect.

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