A Dictionary of applied chemistry v. 4, 1913, Volume 4Longmans, Green and Company, 1913 |
Common terms and phrases
acetic acid action alcohol alkali ammonia ammonium anhydride Annalen aqueous barium benzene blue boiling bromide bromine calcium carbon carnallite caustic Chem chim chloride colourless compounds Compt condensation containing COOH copper crude crystallises crystals decomposed derivatives dilute dioxide dissolved distillation employed ester ether evaporation extract ferric formed gelatin grms heating hydrochloric acid hydrogen hydrolysis hydroxide ibid insoluble iodide liquid liquor manufacture melts metal method methyl mineral mixture needles nitrate nitric acid nitrogen obtained opium ordinary oxalate oxalic acid oxide oxidising oxygen ozone paper paraffin petroleum Pharm phenol phosphoric acid phosphorus phthalic phthalic acid picric pigments plate platinum potash potassium potassium chloride powder precipitate prepared present prisms proteins pyrogallol quantity readily rend resin retorts rotation salt silver soda sodium soluble solution sp.gr substances sulphate sulphuric acid temperature tion Trans tube washed yellow yields Zeitsch Zentr zinc
Popular passages
Page 142 - ... moving in grooves, and having perforations corresponding to those on the lid. In moving the slide so as to uncover the holes, the oscillating lamp is caught by a pin fixed in the slide, and tilted in such a way as to bring the end of the spout just below the surface of the lid. Upon the slide being pushed back so as to cover the holes, the lamp returns to its original position. Upon the cover, in front of and in line with the mouth of the lamp, is fixed a white bead, the dimensions of which represent...
Page 142 - A split socket similar to that on the cover of the oil cup, but set at a right angle, allows a thermometer to be inserted into the space between the two cylinders. The bath is further provided with a funnel, an overflow pipe, and two loop handles. The bath rests upon a cast-iron tripod stand, to the ring of which is attached a copper cylinder or jacket (24 BWG) flanged at the top, and of such dimensions that the bath, while firmly resting on the iron ring, just touches with its projecting top the...
Page 143 - The air chamber which surrounds the cup is filled with cold water to a depth of 14 inch, and the heating vessel or water bath is filled as usual, but also with cold water. The lamp is then placed under the apparatus, and kept there during the entire operation. If a very heavy oil is being dealt with. the operation may be commenced with water previously heated to 120°, instead of with cold water.
Page 127 - ... the oil, the fraction at the top of the tube being of lower specific gravity than that at the bottom. 2. When water is added to fuller's earth which contains petroleum, the oil which is displaced first differs in specific gravity from that which is displaced afterwards when more water is added.
Page 146 - The water bath, with its thermometer in position, is placed in some locality where it is not exposed to currents of air, and where the light is sufficiently subdued to admit of the size of the entire test-flame being compared with that of the bead on the cover.
Page 146 - DIRECTIONS FOR DRAWING THE SAMPLE AND PREPARING IT FOR TESTING. 1. Drawing the Sample. — In all cases the testing officer, or some person duly authorised by him, shall personally superintend the drawing of the sample from an original unopened tin or other vessel. An opening sufficiently large to admit of the oil being rapidly poured or siphoned from the tin or other vessel shall be made. Two bottles, each of the capacity of about 40 fluid ounces, are to be filled with the oil. One of these, the...
Page 144 - The method of carrying out the test of such solid mixture shall be as follows : — The solid mixture must be cut into cylinders...
Page 146 - F., and this is attained in the first instance either by mixing hot and cold water in the bath, or in a vessel from which the bath is filled, until the thermometer which is provided for testing the temperature of the water gives the proper indication; or by heating the water with the spirit lamp (which is attached to the stand of the apparatus) until the required temperature is indicated.
Page 100 - Everything being thus prepared, and the skin being well softened, the workman stretches it powerfully by means of the skewers ; he attaches the cords to the skewers, and fixes their ends to the iron pegs or pins. He then stretches the skin, first with his hand applied to the pins, and afterwards with the key.
Page 141 - ... from the bottom of the cup. It is made of gun metal or brass (17 BWG) tinned inside. A bracket, consisting of a short stout piece of wire bent upwards and terminating in a point, is fixed to the inside of the cup to serve as a gauge. The distance of the point from the bottom of the cup is 1 J".