Chemical Essays, المجلد 4T. Evans, 1788 |
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acid alfo antimony atmoſphere bar iron black jack Boyle brafs braſs cadmia caft calamine calcareous calcareous earth calcination called caufes cinnabar colour compofed compofition confifts contained copper veffels covering cubic foot degree of heat Derbyshire different forts diftilled Engliſh eſtabliſhed eſteemed experiment expofed faid falt fame fays feems feen fhould fide filver fimilar fince fire firft firſt flate Flintshire fmall folution fome fpecula fquare ftance fteel ftone fubject fuch fufficient fulphur fuppofing furface glafs glaſs gold grains Hift increaſe iron itſelf laft lead lefs lofe loft manufactures Marggraf melted mercury metallic fubftance mineral mixed mixture moſt muſt obferved orichalcum ounces perfon pewter philofophers plates Pliny pofe poffible poliſhed pounds pounds weight prefent publiſhed pure tin purpoſe quantity quickfilver reafon refembling refpect Ruffia ſmall ſpeaking ſtate ſtone Strabo ſubſtance tained thefe theſe thickneſs thoſe tion Tranf tranfmutation uſed water into earth Weftmoreland weight zinc
مقاطع مشهورة
الصفحة 52 - Old brass, which has frequently been exposed to the action of fire, when mixed with the copper and calamine, renders the brass far more ductile, and...
الصفحة 159 - ... about 320 pounds weight of metal, which, when hardened, is called a block of tin ; each block of tin is coined in the following manner...
الصفحة 160 - The officers appointed by the Duke of Cornwall assay it. by taking off a piece of one of the under corners of the block, partly by cutting, and partly by breaking ; and if well purified, they stamp the face of the block with the...
الصفحة 179 - The common method of tinning confifts in making the furface of the: copper vefiel quite bright, by fcraping ing it, and by wafhing it with a folution of fal ammoniac ; it is then heated, and the tin, or metallic mixture defigned for tinning, is melted, and poured into it, and being made quickly to flow over every part of the furface of the veflel, it incorporates with the copper, and, when cold, remains united with it.
الصفحة 241 - Y upon the tin leaf, in such a manner as to sweep off the redundant quicksilver, which is not incorporated with the tin ; leaden weights are then placed on the glass ; and in a little time the quicksilvered...
الصفحة 315 - ... quantity which had been spread over its surface; for it was the quantity which had been imbibed by the slate, the surface of which was equal to that of the tile ; the tile was left to dry in a room heated to 60 degrees, and it did not lose all the water it had imbibed in less than six days.
الصفحة 176 - Zinc was long ago recommended for the tinning of copper res. sels, in preference both to the mixture of tin and lead, and to pnre tin* : and zinc certainly has the advantage of being harder than tin, and of bearing a greater degree of heat before it will be melted from the surface of the copper; so that on both these ac. counts it would, when applied on the surface of copper, last longer than tin ; just as tin, for the same reasons, lasts longer than a mix.
الصفحة 187 - ... they thought fit. They, moreover, applied filver upon copper, in the fame way in which they applied tin upon it * ; and they ufed This defcription feems to be expreffive of the manner of tinning, by putting the copper into melted tin, as is pradifed in the tinning of iron plates.
الصفحة 213 - It is evident that the durability of the plating must depend on the number of leaves which are applied on the same quantity of surface. For ornaments which are not much used, ten leaves may be sufficient : but an hundred will not last long, without betraying the metal they are...
الصفحة 119 - Something of this kind may hare been the case with respect to orichalcum, and the most ancient Greeks may have known no more of the manner in which it was made, than we do of that in which the Chinese prepare their white copper...