Chemical News and Journal of Industrial Science, Volum 5Chemical news office, 1862 |
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Resultats 1 - 5 de 49.
Pàgina 12
... flames on the surface of newly run steel would afford the means of detecting the presence of metals and other bodies by the new method of spectrum analysis . " " A Paper entitled , " Nouveau Système de Communication Télégraphique ...
... flames on the surface of newly run steel would afford the means of detecting the presence of metals and other bodies by the new method of spectrum analysis . " " A Paper entitled , " Nouveau Système de Communication Télégraphique ...
Pàgina 14
... flame to light of its own colour was that experiment a large white disc . The opacity of the yellow sodium alone which was less conclusively exhibited in this manner , apparently from its requiring extreme delicacy of manipulation . We ...
... flame to light of its own colour was that experiment a large white disc . The opacity of the yellow sodium alone which was less conclusively exhibited in this manner , apparently from its requiring extreme delicacy of manipulation . We ...
Pàgina 22
... flame of a lamp , as I have here , then , I say , that the light does not cast what we call a sharp shadow . It casts a shadow , but that shadow is surrounded at its edges by a fringe , which is called a penumbra . Now , when I hold ...
... flame of a lamp , as I have here , then , I say , that the light does not cast what we call a sharp shadow . It casts a shadow , but that shadow is surrounded at its edges by a fringe , which is called a penumbra . Now , when I hold ...
Pàgina 35
... flame will go downwards when the image is thrown clearly upon the screen . I have now to go on to another and very distinct portion of the subject , and I must try and make this perfectly clear to you by a somewhat gross image . I ask ...
... flame will go downwards when the image is thrown clearly upon the screen . I have now to go on to another and very distinct portion of the subject , and I must try and make this perfectly clear to you by a somewhat gross image . I ask ...
Pàgina 46
... flame and by the odour of sulphurous acid which they give when burning . When this happens , which is very rare , and indicates generally a badly - incorporated mixture , the analysis should be recommenced . I am satisfied ( and this is ...
... flame and by the odour of sulphurous acid which they give when burning . When this happens , which is very rare , and indicates generally a badly - incorporated mixture , the analysis should be recommenced . I am satisfied ( and this is ...
Altres edicions - Mostra-ho tot
Frases i termes més freqüents
acetic action alcohol alkaline alumina ammonia analysis aniline apparatus appears atmosphere beam beautiful blue body boiling bromine brown carbonic acid cent charcoal chemical CHEMISTRY chemists chloride chromic acid coal colouring matter compounds containing copper crystallised crystals decomposed dilute dissolved distilled employed Ether sol ethylamine evaporated experiments explosion filtered flame flask formed gases glass grains grammes heat hydrochloric acid hydrogen Improvements insoluble iodine iron lecture light lime lines liquid London manufacture mercury metal method minutes mixed mixture nitrate nitric acid nitrogen observed obtained Oleum organic oxalic oxalic acid oxide oxygen paper passed phosphoric acid platinum portion potash potassium precipitate present prism produced Professor proportion pure rays reaction refraction residue rubidium salt silver soda sodium soluble solution specimens spectra spectrum strychnia substance sulphate sulphide sulphuric acid surface tartaric acid temperature tion tube vapours yellow zinc
Passatges populars
Pàgina 214 - The strontia flame exhibits a great number of red rays well separated from each other by dark intervals, not to mention an orange and a very definite bright blue ray. The lithia exhibits one single red ray. Hence I hesitate not to say that optical analysis can distinguish the minutest portions of these two substances from each other with as much certainty, if not more, than any other known method.
Pàgina 82 - I now think it quite certain that two metals dipped in one electrolytic liquid will (when polarization is done away with) reduce two dry pieces of the same metals when connected each to each by metallic arcs to the same potential...
Pàgina 137 - ... a wire connects with a similar cylinder and electrometer in a distant apartment; and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate; from which it appears that he has formed an alphabet of motions. As the length of the wire makes no difference in the effect, a correspondence might be carried on at any distance; within and without a besieged town, for instance; or for a purpose much more worthy, and a thousand times more harmless, between two...
Pàgina 327 - Of Man's great Ignorance of the Uses of Natural Things ; or that there is no one thing in Nature whereof the uses to human life are yet thoroughly understood " — a saying which is still as true now as when it was written.
Pàgina 247 - It has the same effect when sprinkled on the foliage of fruit trees. A paste of one part of powdered chloride of lime and one-half part of some fatty matter, placed in a narrow band round the trunk of the tree, prevents insects from creeping up it It has even been noticed that rats and mice quit places in which a certain quantity of chloride of lime has been spread. This salt, dried and finely powdered, can, no doubt, be employed for the same purposes as flour of sulphur, and be spread by the same...
Pàgina 214 - For instance, the orange ray may be the effect of the strontia, since Mr. Herschel found in the flame of muriate of strontia a ray of that colour. If this opinion should be correct, and applicable to the other definite rays, a glance at the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect.
Pàgina 137 - In electricity he has made a remarkable discovery: you write two or three words on a paper ; he takes it with him into a room, and turns a machine inclosed in a cylindrical case, at the top of which is an electrometer, a small fine pith ball ; a wire connects with a similar cylinder and electrometer in a distant apartment ; and his wife, by remarking the corresponding motions of the ball, writes down the words they...
Pàgina 202 - ... in each case; the appearances are so different, that, by this mode of examination, the metals may be readily distinguished from each other.
Pàgina 242 - Wormley, vision with the most powerful microscope is limited to objects of about al?$uoth of an inch, we need not be surprised if infusoria and other organisms appear in putrescible liquids in far greater numbers than the germs in atmospheric dust visible by the aid of the microscope would lead us to expect. — TR...
Pàgina 142 - ... wings. Viewed by transmitted light, the crystals are red, and in large mass almost opaque. The aqueous or alcoholic solutions of these salts possess the magnificent crimson colour so well known. The tri-acid salts, on the contrary, are of a yellowish brown, both in the solid state or in solution, and they are much more soluble in water and alcohol than the monoacid salts, which are comparatively but slightly soluble. The mono-hydrochlorate of rosaniline may be prepared either by combining the...