Chemical Manipulation: Being Instructions to Students in Chemistry on the Methods of Performing Experiments of Demonstration Or Research, with Accuracy and Success

J. Murray, 1842 - 664 pagina's

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Pagina 130 - metal answers the purpose admirably. It consists of 8 parts of bismuth, 5 of lead, and 3 of tin, fused together. It melts at a heat below 212į, and will bear a red or even white heat without evolving fumes ; but at dull redness, thick films of oxide form on its surface, which increase with its temperature. Tin or lead
Pagina 63 - of a grain. For if the thing to be weighed weighs one grain, it will, when placed on one extremity of the beam, counterpoise the large gold weight at the other extremity ;—if it weigh half a grain, it will counterpoise the heavy gold weight placed at 5 ;—if it weigh
Pagina 354 - the water, and dried by an assistant with a towel or with blotting-paper ; the point of the bent tube is then to be introduced into the aperture of the tube standing over quicksilver, and on withdrawing the finger from that aperture, which is now uppermost, the pressure of the
Pagina 64 - one grain and a fraction, it will be counterpoised by the heavy gold weight at the extremity, and one or more of the lighter ones placed on some other part of the beam. 'This beam has served me hitherto for every
Pagina 509 - When the end of the tube is to be heated instead of the middle, more care is required, in consequence of the great facility with which cracks commence at an edge. A heat which would cause no danger if applied to the middle of a tube, would instantly cause the extremity to fly to pieces. In such cases it is best to begin by
Pagina 118 - the fold of a piece of paper like gold between skins. The clay and paper are then cut together with scissars into pieces about four-tenths of an inch long and two and a half tenths of an inch wide, and hardened in the fire in a tobacco pipe. When cut into small and very acute triangles, they form a substitute for Saussure's
Pagina 64 - end. A fulcrum of tempered steel, resembling the blade O f a penknife, is made to pass through the middle of the beam a little above the centre of gravity. Similar steel blades are also made to pass through the ends of the beam for
Pagina 354 - bore, and bent at the end, so as to resemble the italic letter /. The point is then immersed in quicksilver, which is drawn into the tube till it is filled by the action of the mouth. Placing the finger over the
Pagina 493 - if any part of the surface becomes dry before the lute is applied, it should be re-moistened. The lute should be pressed and rubbed down upon the glass successively, from the part where the contact was first made to the edges, until all air bubbles are excluded, and an intimate adhesion effected.
Pagina 7 - In the pursuit of this object it is intended to describe— The conveniences and requisites of a Laboratory. General Chemical Apparatus, and its uses. The methods of performing Chemical Operations. The facilities acquired by Practice; and The causes which make Experiments fail or succeed. Although a laboratory will be described in a complete state, well appointed, and with

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