Memoirs of the Literary and Philosophical Society of ManchesterThe Society, 1860 |
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Seite 111 - Cu10, consisting of copper 84-68 and tin 15-32, when the brittleness ceases; but strange to say this alloy, which contains four-fifths of its weight of copper, is notwithstanding nearly as hard as iron. This remarkable influence of copper in the bronze alloys is also visible in those composed of Sn Cuj6, containing 88'97 of copper.
Seite 11 - CALLAWAY, JOHN: Yakkun Nattannawa; A Cingalese Poem descriptive of the Ceylon System of Demonology, to which is added: The Practices of a Capua or Devil Priest, as described by a Buddhist: and Kolan Nattannawa, a Cingalese Poem, descriptive of the characters assumed by natives of Ceylon in a Masquerade. London, 1829. CAMPBELL, A.: Journal of a trip to Sikkim. Journ. As. Soc. Beng., Vol. XVIII., p. 482. Diary of a Journey through...
Seite 146 - ... sustained." Again, in page 181, he says : " In the solid and liquid excrements of man and of animals, we restore to our fields the ashes of the plants which served to nourish these animals. These ashes consist of certain soluble salts and insoluble earths which a fertile soil must yield, for they are indispensable to the growth of cultivated plants.
Seite 15 - ... well furnished'. 14,042 dwellings did not achieve this minimum. The enquiry covered 64 per cent of the population of Manchester (Report of A Committee of the Manchester Statistical Society on the Condition of the Working Classes in an extensive manufacturing district, in 1834, 1835 and 1836, London, 1838, Read at the Statistical Section of the British Association for the Advancement of Science, Liverpool, 1837).
Seite 108 - These results show that all the alloys containing an excess of copper are much harder than the metals composing them, and what is not less interesting, that the increased degree of hardness is due to the zinc, the softer metal of the two which compose these alloys. The quantity of this metal must, however, not exceed 50 per cent, of the alloy, or the alloy becomes so brittle that it breaks as the steel point penetrates. We believe that some of these alloys, with an excess of zinc, and which...
Seite 117 - ... forming a deep yellow solution, from which the greatest part of the colouring matter is precipitated by water in yellow flocks. If, however, the solution in acid be heated it becomes black and gives off sulphurous acid in abundance, the colouring matter being decomposed. When the substance is dissolved in boiling water to which a little sulphuric acid has been added, and the solution is boiled for some time, no decomposition apparently takes place, proving that this colouring matter is not, like...
Seite 101 - I obtained from London a number of other bars, consisting of iron and nickel, which, on being submitted to the same tests as before, gave better results than those obtained in the previous experiments when nickel prepared from the ore was employed.
Seite 109 - ... not to exceed that proportion. If, however, they had increased the quantity to exactly 50'68 per cent, and mixed the metals well, they would have obtained an alloy as rich in colour as if it had contained 90 per cent, of copper, and of a hardness three times as great as that given by calculation. In order to enable engineers to form an opinion as to the value of this cheap alloy, we give them the degrees of hardness of several commercial brasses : — The alloy Cu Zn possesses another remarkable...
Seite 107 - A result was never accepted without at least two experiments being made, which corresponded so far as to present a difference of only a few pounds. The following table gives the relative degree of hardness of some of the more common metals. We specially...
Seite 109 - We believe that some of these alloys, with an excess of zinc, and which are not found in commerce, owing to their white appearance, deserve the attention of engineers. There is in this series an alloy to which we wish to draw special attention, viz., the alloy Cu Zn composed in 100 parts of Copper, 49-32 Zinc...