A System of Theoretical and Practical Chemistry, Volume 1Old Compton Street, Soho, and G. Kearsley, Fleet Street [and 3 others], 1803 - Chemical elements - 373 pages |
Contents
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Common terms and phrases
absorbed action aeriform alcali ammonia ardent spirit atmospheric air barytes bason becomes converted bismuth boiling bottle burn caloric capable carbonated hidrogen gas carbonic acid gas charcoal chemical affinity chemistry colour combination combustion compound contained corpuscular attraction decomposed decomposition degree diamond disengaged dissolved emitted equal ether EXPERIMENT II exposed filled flame Florence flask fluid gases gazeous oxid glass tube gradually heat Hence ignited inflammable iron light carbonated hidrogen likewise lime luminous magnesia manganese melted mercury metals mixture muriatic acid gas nitrate nitric acid nitrous gas obtained oxigen gas oxigenated muriatic acid particles phial philosophers phosphorated hidrogen gas phosphoric acid phosphorus potash produced properties proportion quantity of caloric RATIONALE...The rays of light retort SECT soda solid solution specific gravity substances sulphate sulphurated hidrogen gas sulphureous acid gas sulphuret sulphuric ether surface take fire takes place temperature thermometer unites vapour vegetable vessel zinc
Popular passages
Page 115 - When the shadow of any figure is thrown upon the prepared surface, the part concealed by it remains white, and the other parts speedily become dark.
Page 115 - The copy of a painting or the profile, immediately after being taken, must be kept in an obscure place ; it may, indeed, be examined in the shade, but in this case the exposure should be only for a few minutes ; by the Light of candles or lamps, as commonly employed, it is not sensibly affected.
Page 115 - They have been covered with a thin coating of fine varnish, but this has not destroyed their susceptibility of becoming coloured ; and even after repeated washings, sufficient of the active part of the saline matter will still adhere to the white parts of the leather or paper, to cause them to become dark when exposed to the rays of the sun.
Page 90 - Spain, a kind of earthen jars, called buxaros, is used, the earth of which is so porous, being only half-baked, that the outside is kept moist by the water which filters through it ; and", though placed in the sun, the water in the jar becomes as cold as ice. It is a common practice in China, to cool wine or other liquors by wrapping a wet cloth round the bottle, and hanging it up in the sun. The water in the cloth evaporates, and thus cold is produced. Ice may be produced at any time by the evaporation...
Page 38 - ... the glasses and stir it, it will be changed into a crimson ; put a few drops of fixed alkali dissolved into the other glass, and when you stir it, it will change to green. If you drop slowly into the green liquor, from the side of the glass, a few drops of acid of vitriol, you will perceive crimson at the bottom^ purple in the middle, and green at the top ; and by adding a little fixed alkali dissolved to the other glass, the same colours will appear in different order. Another.
Page 69 - OF THE PYROMETER. To measure those higher degrees of heat to which the thermometer cannot be applied, there have been other instruments invented by different philosophers, these are called pyrometers. The most celebrated instrument of this kind, and which has been adopted into general use, is that invented by the late ingenious Mr. Wedgwood. This instrument is also sufficiently simple. It consists of two pieces of brass fixed on a plate so as to be...
Page 215 - This is merely a graduated glass cylinder, containing a given quantity of air, exposed to a mixture of iron filings and sulphur, formed into a paste with water. The substances may be made use of in the following manner : . Make a quantity of sulphur in powder, and iron filings, into a paste with water, and place the mixture in a saucer, or plate, over water, on a stand raised above the fluid ; then invert over it a graduated bellglass, and allow this to stand for a day or two. The air contained in...
Page 115 - When the solar rays are passed through a print and thrown upon prepared paper, the unshaded parts are slowly copied ; but the lights transmitted by the shaded parts, are seldom so definite as to form a distinct resemblance of them by producing different intensities of colour. The images formed by means of a camera obscura, have been found to be too faint to produce, in any moderate time, an effect upon the nitrate of silver.
Page 116 - In following these processes, I have found that the images of small objects, produced by means of the solar microscope, may be copied without difficulty on prepared paper. This will probably be a useful application of the method ; that it may be employed successfully, however, it is necessary that the paper be placed at but a small distance from the lens.
Page 52 - ... the solution of soda by little at a time, and examine the mixture after every addition, we shall find that for a considerable time it will exhibit the properties of an acid, reddening vegetable blues, and having...