Laboratory: A Weekly Record of Scientific Research, Volumen11867 |
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Términos y frases comunes
acetic acetic acid action alcohol aldehyde alkaline ammonia amount amylene anthracene appears atoms body boiling bromine carbonic acid cent chemical chemistry chemists chlorhydric chloride Class 44 coal coal-gas colour compound containing copper corresponding crystallised crystals cyanhydric acid decomposed decomposition deposits dilute dissolved distilled ether ethyl examination exhibited exhibitors experiments fact flame formed formula gases give glass grammes heat hydrate hydric hydrocarbon hydrochloric acid hydrogen insoluble iodide iron isomeric LABORATORY lectures light lime liquid London manufacture mercury Messrs metal method mineral mixed mixture molecule nitrate nitric acid nitrogen obtained ordinary organic matter oxide oxidised oxygen paper Paris permanganate platinum potash potassium precipitate present Professor quantity reaction Royal salt scientific shown silicate silver Society soda sodic sodium soluble solution specific gravity specimens substance sulphate sulphide sulphuric acid temperature tion tube vapour volume weight wire yields zinc
Pasajes populares
Página 382 - My desire to escape from trade, which I thought vicious and selfish, and to enter into the service of Science, which I imagined made its pursuers amiable and liberal, induced me at last to take the bold and simple step of writing to Sir H. Davy...
Página 382 - I am obliged to go out of town, and shall not bo settled in town till the end of January ; I will then see you at any time you wish. It would gratify me to be of any service to you. I wish it may be in my power. I am, sir, your obedient, humble servant, H. DAVY.
Página 302 - The chemical atom will always remain the chemical unit ; and for specially chemical considerations we may always start from the constitution of atoms, and avail ourselves of the simplified expression thus obtained, that is to say, of the atomic hypothesis. We may, in fact, adopt the view of Dumas and of Faraday, " that whether matter be atomic or not, thus much is certain, that granting it to be atomic, it would appear as it now does.
Página 302 - I have no hesitation in saying that, from a philosophical point of view, I do not believe in the actual existence of atoms, taking the word in its literal signification of indivisible particles of matter...
Página 384 - British empire, a public institution for diffusing the knowledge and facilitating the general introduction of useful mechanical inventions and improvements, and for teaching, by courses of philosophical lectures and experiments, the application of science to the common purposes of life.
Página 382 - At the same time that he thus gratified my desires as to scientific employment, he still advised me not to give up the prospects I had before me, telling me that Science...
Página 302 - Should the progress of .science lead to a theory of the constitution of chemical atoms — important as such a knowledge might be for the general philosophy of matter — it would make but little alteration in chemistry itself. The chemical atoms will always remain the chemical unit ; and for the...
Página 406 - The observer stands with his eyes about two feet from the large lens. With his right eye he sees the real image of the left-hand picture formed by the left-hand lens in the air close to the large lens, and with the left eye he sees the real image of the other picture formed by the other lens in the same place. The united images look like a real object in the air, close to the larger lens.
Página 302 - The question whether atoms exist or not has but little significance in a chemical point of view : its discussion belongs rather to metaphysics. In chemistry we have only to decide whether the assumption of atoms is an hypothesis adapted to the explanation of chemical phenomena.
Página 406 - If the armature in connection with the electromagnet is made to rotate, there will be a very feeble current generated in it ; this passing round, the electro-magnet will increase its power with every additional impulse. It will thus be seen that the only limit to the power of the machine is the rapidity with which the armature is made to rotate, which is entirely dependent on the amount of dynamic force employed.