The Moon: Considered as a Planet, a World, and a Satellite |
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action Albemarle Street Apennines appear astronomer body bright streaks cause central cone centre chasms circular colour comparatively consider conspicuous cooling Copernicus cosmical cracks crust degree disc distance E. B. TYLOR earth eclipse effect ejected eruption evidence exhibit existence expansion feet fluid force formation full moon G. E. STREET gravitation heat height Herodotus illumination Illustrations landslip lava libration light lunar atmosphere lunar craters lunar globe lunar surface MARY SOMERVILLE mass material molten matter moon's surface motion mountain Nasmyth nearly nebula object observed orbital revolution origin peaks phenomena planetary planets Plate plateau Plato portion present produced Ptolemy radiating rampart rays reference remarkable result ridges rise satellite scoria seen shadow side small craters solar solid solidified sphere spots stars summit sun's suppose surrounding telescope temperature terrestrial theory Tycho vapour vast vent Vesuvius visible volcanic volcanic crater zodiacal light
Popular passages
Page 13 - Heat is a very brisk agitation of the insensible parts of the object, which produces in us that sensation from whence we denominate the object hot ; so what in our sensation is heat, in the object is nothing but motion.
Page 34 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 34 - The law of gravitation states that the force of gravitation is directly proportional to the mass, and inversely proportional to the square of the distance.
Page 14 - He also urged water through capillary tubes, and determined the amount of heat generated by the friction of the liquid against the sides of the tubes. And the results of his experiments leave no shadow of doubt upon the mind that, under all circumstances, the quantity of heat generated by the same amount of force is fixed and invariable.
Page 15 - foot-pound " has been introduced to express in a convenient way the lifting of one pound to the height of a foot. Thus, the quantity of heat necessary to raise the temperature of a pound of water one degree Fahrenheit being taken as a standard, 772 foot-pounds constitute what is called the mechanical equivalent of heat.
Page 5 - ... occur to any one who has not before him the result of the critical examination of the nebulous system which has been displayed in this paper. The end I have had in view, by arranging my observations in the order in which they have been placed, has been to show, that the above mentioned extremes may be connected by such nearly allied intermediate steps, as will make it highly probable that every succeeding state of the nebulous matter...
Page 5 - The total dissimilitude between the appearance of a diffusion of the nebulous matter and of a star, is so striking, that an idea of the conversion of the one into the other can hardly occur to any one who has not before him the result of the critical examination of the nebulous system which has been displayed in this paper. The end I have had in view, by arranging my observations in the order in which they have been placed, has been to...
Page 14 - ... its moving force destroyed by collision with the earth. Conversely, the amount of heat necessary to raise a pound of water one degree in temperature...