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Página 122 - As the cold of snow in the time of harvest, so is a faithful messenger to them that send him: for he refresheth the soul of his masters.
Página 95 - First, they transfer the friction which would take place between a sliding body and the comparatively rough uneven surface over which it slides, to the smooth oiled peripheries of the axis and box, where the absolute quantity of the friction as opposing resistance is also diminished by leverage, in the proportion of the wheel to that of the axis.
Página 167 - ... quartz, the diameter of which was so small (not exceeding the one-third of the millionth part of an inch), that they were incapable of reflecting a single ray of the strongest light. In describing this, Sir David Brewster predicted that " fractures of quartz and other minerals would yet be found which should exhibit a fine down of different colours depending on their size.
Página 414 - I have acquired by imitation, labour, and patience, an internal movement, which neither thoughts nor labour, nor any thing can stop; it is similar to that of a pendulum, which at each motion of going and returning gives me the space of three seconds, so that twenty of them make a minute, and these I add to others continually.
Página 48 - Oil resembles the essential oil obtained by distillation and other artificial processes; it is, however, more volatile, and highly rectified, than any of them ; its specific gravity hardly exceeding that of alcohol. When pure, it is colourless and transparent : its taste is warm and pungent ; its odour aromatic, and closely allied to that of the oily and resinous juice of the Coniferce. It is volatile, and evaporates without residuum, at the atmospheric temperature. It is inflammable, burning entirely...
Página 309 - often endeavoured to measure the power of the sun between the tropics, by two thermometers of mercury perfectly equal, one of which remained exposed to the sun, while the other was placed in the shade. The difference resulting from the absorption of the rays in the ball of the instrument never exceeded 3°-7 (6°-6 Fahr.); sometimes it did not even rise higher than one or two degrees.
Página 97 - Springs were in all likelihood applied at first to carriages, with no other view than to accommodate travellers. They have since been found to answer several important ends. They convert all percussion into mere increase of pressure — that is, the collision of two hard bodies is changed by the interposition of one that is elastic, into a mere accession of weight. Thus the carriage is preserved from injury, and the materials of the road are not broken : and, in surmounting obstacles, instead of...
Página 142 - ... piercing notes may be softened by distance before they reach the ear; while the mellow blackbird seeks the inferior branches. Should the sun, having been eclipsed with a cloud, shine forth with fresh effulgence, how frequently we see the goldfinch perch on some blossomed bough, and hear his song poured forth in a strain peculiarly energetic...
Página 126 - The liquor is collected in small vats, whence it is removed early in the following day into puncheons which have been previously sulphured; in these the must undergoes a brisk fermentation, and is allowed to remain till towards the end of December, when it becomes bright. It is then racked, and fined with isinglass, and in a month or six weeks more it is racked and fined a second time. In the month of March it is bottled ; after it has been six weeks in bottle it becomes brisk, and towards autumn...
Página 142 - The robin again sets up his twilight song, till the still more serene hour of night sends him to the bower to rest. And now to close the scene in full and perfect harmony, no sooner is the voice of the robin hushed, and night again spreads a gloom over the horizon, than the owl sends forth his slow and solemn tones. They are inure than plaintive, and less than melancholy, and tend to inspire the imagination with a train of contemplations well adapted to the serious hour.