Practical facts in chemistry[T.] Tegg [and Son, 1837 - 193 стор. |
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Загальні терміни та фрази
36 Chlorine acetate of lead alkalies Ammonia apparatus apply a light arsenic barytes blowpipe bodies bottle Brazil wood bulb tube carbonate of potass Carbonic Acid charcoal chemistry Chlorate of Potass Chloric Acid Chlorine colour combine combustion compound containing copper cork crucible crystals Deutoxide of Nitrogen diluted dissolved distilled dram drop EDE'S employed evaporating experiment ferrocyanate fire flame flask fluid flux gases glass tube grains heat Hydriodic Acid Hydrogen lime liquid Litmus Manganese mercury metal muriatic acid nitrate nitrate of silver nitric acid Nitrogen operation ounce oxalate oxalic acid oxide Oxygen paper phial Phosphorus piece platinum pneumatic trough PORTABLE LABORATORIES portion Potassium powder prepared procured Protoxide quick lime re-agents salt small quantity Soda solid solution spirit lamp student substance sulphate sulphureted hydrogen Sulphuric Acid taper test box test tube tube retort vapour weight wire wood-cut Zinc
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Сторінка 9 - ... he forces a continual stream of air from the anterior part of the mouth through the blowpipe. When the mouth begins to be empty, it is replenished by the lungs in an instant, while the tongue is withdrawn from the roof of the mouth, and replaced again in the same manner as in pronouncing the monosyllable tut. In...
Сторінка 8 - ... breathing without interruption through the nostrils. This is done by applying the tongue to the roof of the mouth, so as to interrupt the communication between the anterior part of the mouth and the passage of the nostrils. When the mouth begins to be empty, it is replenished by the lungs in an instant, while the tongue is withdrawn from the roof of the mouth, and replaced again in the same manner as in pronouncing the monosyllable tut.
Сторінка 163 - I) to contaminate the distilled products. The tube is then to be placed as in the figure, the proportion of the vessel and the charge being such, that the latter should not occupy more than half that part of the tube. Heat being then gradually applied near the top of the fluid, the latter should be distilled over, into the angle at b, which is now to be cooled by wet paper, water, or some other means. If the distillation be unsatisfactory...
Сторінка 9 - ... the cavity of the mouth : all subsequent supplies of air are to be introduced in the same manner as the first. Thus, with a little practice, the power may be obtained of keeping up a continued blast for as many minutes as may be necessary for any ordinary operation.* IV.
Сторінка 9 - The stream of air must be blown along this horizontal part as near as may be without striking the wick. If the flame be ragged and irregular, it is a proof that the hole...
Сторінка 5 - It was said by an author belonging to the last century, of alchemy, " that its beginning was deceit, its progress labour, and its end beggary." It may be said of modern chemistry, that its beginning is pleasure, its progress knowledge, and its objects truth and utility.
Сторінка 5 - ROM the present state of chemical knowledge, and the rapid improvements in our arts and manufactures by the judicious application of its principles, it is become desirable that every youth should be acquainted with its rudiments, and that CHEMISTRY should be made a regular branch of education.
Сторінка 174 - Even without any process of exhaustion, evaporation at common temperatures may be carried on by the use of desiccators, more rapidly in close vessels than in the open air, unless indeed a current be taken advantage of; and a wide-mouthed stoppered bottle, or ajar placed over, or in a basin, will at times supply the want of better apparatus.
Сторінка 8 - ... mouth shut. Let him then learn to distend the cheeks with the air thus inspired, and to make several respirations, without suffering any air to escape from his mouth: when able to accomplish this, let him take a blow-pipe between his lips, and having filled his mouth with air, let him expel it gently through the tube by the action of the muscles of the cheeks, while he breathes through the nostrils. To this end the tongue must be applied to the palate, so as to interrupt the communication between...
Сторінка 163 - ... and the latter being held upright, and the finger placed over the aperture, heat should be applied below and vapour raised ; this will condense upon the sides of the tube and flow down, carrying with it that portion of the fluid which, in pouring it in, adhered to the side ; this should be done till it is observed that the vapour rises nearly to the top before it condenses, and insures the cleansing of the whole tube. This preliminary operation is intended simply to wash the adhering portion...