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Seite 288 - WASHINGTON STREET, BOSTON, ANNUAL OF SCIENTIFIC DISCOVERY ; or, Year Book of Facts in Science and Art, exhibiting the most important Discoveries and Improvements in Mechanics, Useful Arts, Natural Philosophy, Chemistry, Astronomy, Meteorology, Zoology, Botany, Mineralogy, Geology, Geography, Antiquities, etc.
Seite 288 - In 1 large vol. 8vo. 21s. Seven Hundred Domestic Hints, combining Elegance and Economy with the Enjoyment of Home. By a LADY. Neatly bound in cloth, 2s. 6d. Floral Fancies ; or, Morals from Flowers. With Seventy Illustrations. Fcp. 8vo.
Seite 135 - ... divided on its circumference into sixty equal parts ; each alternate division is then cut out and filled with a piece of wood, so that the circumference consists of thirty regular alternations of wood and metal. An extremely light brass spring, which is screwed to a block of ivory or hard wood, and which has no connexion with the metallic parts of the clock, rests by its free end on the circumference of the disc. A copper wire is fastened to the...
Seite 104 - ... the very locality from which some of the first waters, which I examined, were taken, and nothing more is wanting to identify the cause of the rapid decay of the ship's copper with that of the mortality of the climate.
Seite 113 - For some days, the only apparent difference was that the earth continued damp under the green and blue fluids, whereas it rapidly dried under the red and yellow. The plumula burst the cuticle in the blue and green lights, before any change was evident in the other parts. After ten days, under the blue fluid there was a crop of cress, of as bright a green as any which grew in full light, and far more abundant.
Seite 237 - The process of mining consists merely in digging out the rolled pebbles and gravel, and carrying them to small square reservoirs raised on mounds, having their bottom paved with stones, and washing them carefully. At the foot of the mound is a clear space surrounded by heaps of refuse, where the washed gravel is again carefully spread out and examined in presence of the diamond contractors ; the diamonds are easily recognised in the moist state by their peculiar lustre.
Seite 5 - After a great variety of experiments, he found that a paddle-wheel of one half the width and weight, and with trapezium floats, was as effective in propelling a vessel as a wheel of double the width and weight with the ordinary rectangular floats. The Admiralty had permitted him to fit her Majesty's steam-ship 'African' with these wheels, and he had perfect confidence in the success of the experiment. Another means of propulsion was the screw, which had been applied with success by Mr Smith in the...