Mineralogia Cornubiensis: A Treatise on Minerals, Mines, and Mining: Containing the Theory and Natural History of Strata, Fissures, and Lodes, with the Methods of Discovering and Working of Tin, Copper, and Lead Mines, and of Cleansing and Metalizing Their Products; Shewing Each Particular Process for Dressing, Assaying and Smelting of Ores. To which is Added, an Explanation of the Terms and Idioms of MinersPrinted and sold for the author by J. Phillips, 1778 - 331 من الصفحات |
من داخل الكتاب
النتائج 1-5 من 46
الصفحة 48
... holes ; these pots are placed in a furnace , where they receive the ne- ceffary heat for the fufion of the Antimony ; but much less than is fufficient to fuse any other of its mixtures , except Lead , with which it is often combined ...
... holes ; these pots are placed in a furnace , where they receive the ne- ceffary heat for the fufion of the Antimony ; but much less than is fufficient to fuse any other of its mixtures , except Lead , with which it is often combined ...
الصفحة 68
... Hole , appearance , from Lodes in Grouan , Moorftone , Ironstone , + Cell . & Collen Kellas , or Crystal ftrata . Goffan never exhibits a rich shew of the leading Tin Ore ; for it is in that nidus more diffeminate and minute .. It ...
... Hole , appearance , from Lodes in Grouan , Moorftone , Ironstone , + Cell . & Collen Kellas , or Crystal ftrata . Goffan never exhibits a rich shew of the leading Tin Ore ; for it is in that nidus more diffeminate and minute .. It ...
الصفحة 81
... hole or chafm impregnated with Metal , that makes no continued line of direction , or regular walls ; nor yet goes down any confiderable depth ; for when a Floor of Ore of this fort is dug away , there appears no footstep or fign of a ...
... hole or chafm impregnated with Metal , that makes no continued line of direction , or regular walls ; nor yet goes down any confiderable depth ; for when a Floor of Ore of this fort is dug away , there appears no footstep or fign of a ...
الصفحة 88
... colour of Iron , very brittle , and full of holes . The fmaller particles of it are of a brownish yellow , very crumbling , and fall to dust by long exposure exposure to the air . It is this Goffan which 88 OF DIFFERENT LODES , AND THE.
... colour of Iron , very brittle , and full of holes . The fmaller particles of it are of a brownish yellow , very crumbling , and fall to dust by long exposure exposure to the air . It is this Goffan which 88 OF DIFFERENT LODES , AND THE.
الصفحة 90
... holes , thence called a Sucked Stone by the Tinners , as if all the heterogeneous matter had been fucked or rather washed out of the Stone , and nothing was left behind but pure folid Tin Ore . This fucked Scovan Lode is larger when it ...
... holes , thence called a Sucked Stone by the Tinners , as if all the heterogeneous matter had been fucked or rather washed out of the Stone , and nothing was left behind but pure folid Tin Ore . This fucked Scovan Lode is larger when it ...
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
Adit adventurers affay alfo almoſt alſo anſwer Antimony aqua fortis becauſe black Tin bottom buddle cafe calcination called cauſe colour confequence confiderable Copper Corniſh Cornwall courſe crucible Cryſtal cylinder depth diſcovered diſcovery diſtance dreffing eafily earth engine expence faid fame fathoms feet feparated feven fhillings fhould fhovel fide Fiffures fink fire firft firſt fituation fize fmall fmelting folid fome fometimes foon ftamping fteam ftones fuch fulphur funk fuppofe furnace Goffan Gold houſe hundred weight inches interfected Iron itſelf laſt leaſt lefs leſs likewiſe Lode meaſure Metal metallick Mineral Mines moft moſt Mundick muſt neceffary obferved perfon pounds preſent proceſs purpoſe quantity raiſed reaſon Redruth ſcoria Semi-metals ſeparate ſeveral Shaft ſhall Shode Silver ſmall ſome ſtate ſteam Stones Strata ſuch theſe thofe thoſe thouſand Tin Tin White Tin White Tin Tin-ftuff Tinners uſed vein waſhed waſte weft White Tin Tin Whym ΙΟ
مقاطع مشهورة
الصفحة 18 - On the proud crest of Satan, that no sight, Nor motion of swift thought, less could his shield, Such ruin intercept : Ten paces huge He back...
الصفحة 311 - The condenfer confifts of one or more pumps furnifhed with clacks and buckets, (nearly the fame as in common pumps) which are wrought by chains faftened to the great working beam of the engine. The pipe, which comes from the cylinder, is joined ;to the bottom of thefe pumps, and the whole condenfer ftands immerfed in a ciftern of cold water fupplied by the engine.
الصفحة 118 - The rod should be firmly and steadily grasped -, for if, when it has begun to be attracted, there be the least imaginable jerk or opposition to its attraction, it will not move any more till the hands are opened, and a fresh grasp taken. The stronger the grasp the livelier the rod moves, provided the grasp be steady and of an equal strength.
الصفحة 13 - All the rivers run into the sea, yet the sea is not full ; unto the place from whence the rivers came, thither they return again.
الصفحة 311 - The cylinder is fmaller than ufual, in proportion to the load, and is very accurately bored. In the moft complete engines it is furrounded, at a fmall diftance, with another cylinder, furnifhed with a bottom and a lid. The interftice between the cylinders communicates with the...
الصفحة 310 - He lias contrived to observe an uniform heat in the cylinder of his engines, by suffering no cold water to touch it, and by protecting it from the air, or other cold bodies, by a surrounding case filled with...
الصفحة 112 - Where metals ripen in vaft cakes of ore. Here, fullen to the fight, at large is fpread The dull unwieldy mafs of lumpifh lead. There, glimmering in their dawning beds, are feen 75 The light afpiring feeds of fprightly tin.
الصفحة 312 - Ib raifes the buckets of the pumps which are hung to the other end of the beam. The exhauftion regulator is now fhut, and the fteam one opened again, which, by letting in the fteam, allows the pifton to be pulled up by the fuperior weight of the pump rods; and fo the engine is ready for another ftroke.
الصفحة 46 - Essays, iv. p. 34. Pryce, in Mineral. Cornub., p. 49, says, " The late Dr. J. Lawson, observing that the flowers of lapis calaminaris were the same as those of zinc, and that its effects on copper were also the same with that semi-metal, never remitted his endeavours till he found the method of separating pure zinc from that ore.