Chemical and Pharmaceutic Manipulations: A Manual of the Mechanical and Chemico-mechanical Operations of the Laboratory ... For the Use of Chemists, Druggists, Teachers and Students |
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Chemical and Pharmaceutic Manipulations: A Manual of the Mechanical and ... Campbell Morfit,Alexander Mucklé No preview available - 2023 |
Chemical and Pharmaceutic Manipulations: A Manual of the Mechanical and ... Campbell Morfit,Alexander Muckle No preview available - 2017 |
Common terms and phrases
alcohol ammonia Antimoniate apparatus applied Argand burner arrangement balance baryta bath blowpipe body Boiling point Borate bottle bottom bulb carbonic carbonic acid centre charcoal chemical Chloride closed cock condensation containing convenient copper cork covered crucible crystals cupel cylinder Deliquescent diameter distillation drawers electricity filter flame flask flue fluid flux funnel furnace fused fusion gases glass gradually heat ignited inches Insoluble Insoluble iron laboratory lamp lead liquid litharge lute matter means mercury metallic mixture mode mouth necessary neck Nitrate nitric acid operations oxide particles perforated piece pipe placed plate platinum porcelain portion position potassa precipitate pressure prevent purpose quantity readily removed retort salt sand-bath screw shelves shown in Fig side soda soluble solution solvent specific gravity steam stop-cock stopper substance Sulphate sulphuric acid surface temperature tion tube vapor vessel volatile weight wire zinc
Popular passages
Page 185 - ... will prevent the metal from running away, and in a few minutes it will cool and take the impression, without the slightest injury to the paper from which it was taken.
Page 271 - ... of the tube, and close the stop-cock. The air in the short leg is now of the same elasticity as that of the atmosphere at the spot ; and the air at the surface of the earth is under the pressure due to the weight of its own superincumbent mass. The amount of this pressure is ascertained by observing the height of the mercurial column in the barometer at the time. Next, pour mercury into the open and longer limb of the bent tube ; the air in the shorter limb will slowly diminish in bulk. When...
Page 94 - A piece of wire, four inches long, on which a screw is cut, proceeds from the middle of the beam downwards. This is pointed to serve as an index, and a small brass ball moves on the screw, by changing the situation of which the place of the centre of gravity may be varied at pleasure. The fulcrum, as before remarked, rests upon an agate plane throughout its whole length, and the scale-pans are attached to planes of agate which rest upon the knife-edges forming the points of support. This method of...
Page 137 - When such an arrangement is exposed to a high temperature, it is obvious that the expansion of the metallic bar will force the index forward to the amount of the excess of its expansion over that of the black-lead, and that, when again cooled, it will be left at the point of greatest elongation.
Page 277 - Iron cement. This mixture is used for making permanent joints generally between surfaces of iron. Clean iron borings, or turnings, are to be slightly pounded, so as to be broken but not pulverized ; the result is to be sifted coarsely, mixed with powdered sal ammoniac and sulphur, and enough water to moisten the whole slightly. It is then to be rammed or caulked into the joints, and the latter drawn together as tightly as possible.
Page 279 - ... adding the latter to effect the mixture, at first by stirring up the mass lightly with a pointed stick or fork ; it will then be found easy, by a little management, to obtain a good mixture without making it very moist.
Page 189 - NB — The reason for the omissions in the last column of this Table, is, the thermometer sinking in these mixtures to the degree mentioned in the preceding column, and never lower, whatever may be the temperature of the materials at mixing.
Page 224 - The cupel containing the lead of the alloy is then placed upon the sand and immediately covered by the crucible, taking care that the notch in its side shall be opposite to, and correspond with, the furnace door; more fuel is added, during which it is well to cover the hole in the top of the muffle with a crucible lid in order to prevent the admission of dirt. When the muffle has become throughout of a bright red heat the furnace door is thrown open...
Page 278 - Being thus luted, the vessels are afterwards to be placed ia a warm situation, over the sand-bath or near the ash-pit, or in the sun's rays. They should not be allowed to dry rapidly or irregularly, and should be moved now and then to change their positions. To prevent cracking during desiccation, and the consequent separation of the coat from the vessel, some chemists recommend the introduction of fibrous substances into the lute, so as mechanically to increase the tenacity of its parts. Horse-dung,...
Page 286 - Thilorier's bath of solid carbonic acid and ether, placing it however under the recipient of an air-pump. By maintaining a constant vacuum, I lowered the temperature to such a degree, that the carbonic acid of the bath was not more volatile than water at the temperature of 86°, for the barometer of the air-pump stood at 28'2 inches, the external barometer being at 29-4. " This arrangement made, I joined together, by means of corks and stop-cocks some small glass and copper tubes, so that with the...