Observations on Metalliferous Deposits and on Subterranean TemperatureWilliam Cornish, 1871 |
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Observations on Metalliferous Deposits, and on Subterranean Temperature ... William Jory Henwood Geen voorbeeld beschikbaar - 2018 |
Observations on Metalliferous Deposits, and on Subterranean Temperature ... William Jory Henwood Geen voorbeeld beschikbaar - 2018 |
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afforded alloy Association auriferous deposits beds bismuth Brazil British Capt Caradon Chañarcillo Chili clay-slate climate composition containing copper copper-ore Cornwall cost cross-veins deep detrital gold different depths directions displacements district elevation extent extracted Extremes fathoms feet felspathic formation Gongo Soco granite heave HENWOOD Highest hornblendic increase intersected iron iron-ores Itabirite Jacotinga John joints Journal July June Lake Superior lead lead-ores limestone lodes Lowest masses Mean depth Mean Mean mean temperature metalliferous deposits metals Mètre micaceous miners mines Morro Velho native nature observations placed portions precipitation of copper produce produce and profits profits proportion of tin-ore proportions of gold proportions of silver quantities quartz range ratios relations Reports rocks Royal Saint sand Sandstone sides silver-ores slate sometimes stream structure subterranean temperature surface Table XIV Table XXII Tables VII talcose temp Trans various vein-stone veins Wheal widths XXIV
Populaire passages
Pagina 767 - On the changes of temperature which take place — at the same, and at different, times, — on the surface and at depths of three, six, and nine feet in the Canga, at Agoa Quente in Brazil The following observations were made with a view to ascertaining the rate at which solar heat penetrates the earth. The high granitic ridge of the Cara^a,* situate in Long. 43° 10
Pagina 745 - Reprinted with revisions and corrections up to 1851. ENGLAND (Continued) 484. WEBB, — , and GEACH, — . History and progress -of mining in the Caradon and Liskeard district. Not available to the author*. WEEKS, JOSEPH D. See No. 1372. 485. WEST, HE Cornish tin mining.
Pagina 723 - After most careful consideration of the subject, and consultation with others who have also been engaged in this enquiry, it has been thought best to confine the observations, as much as possible to the temperature of the streams of water immediately issuing from the unbroken portions of the rocks and veins. The reasons for this preference are ; — that the temperature of the air in mines is affected, not only by the presence of the workmen, the combustion of candles, and the explosion of gunpowder,...
Pagina 765 - Dolcoath in 1821—2 and 1827, it appears that the temperature was increased only 4° in one level with an increased depth of 42 fathoms, giving a ratio between the stations of 1° increase in 10-5 fathoms ; and in another level the temperature was actually 2° to 2°*5 less than in 1822, although 42 fathoms deeper than the mine was then.
Pagina 744 - Sir Henry De la Beche's Report on the Geology of Cornwall, Devon, and West Somerset, and in the Transactions of the Royal Geological Society of Cornwall.
Pagina 768 - L'instrument était muni d'un cordon qui permettait de le retirer pour le consulter. Lorsque le thermomètre était en expérience, on bouchait l'orifice du trou avec un morceau de carton sur' lequel on appliquait une grosse pierre. La température moyenne du village de Zupia avait été fixée à 2l°,5 par de nombreuses séries d'observations' thermométriques faites en 1825, 1826 et 1829- Zupia est élevé au dessus de la mer de 1225 mètres.
Pagina 740 - The Bearhaven mines are opened in rocks, of the * " Thermometers were placed, in August 1843, in the deepest part of Knockmahon Copper Mine; * * * one being sunk three feet into the rock, and another into the lode at a depth of [129 fathoms] from the surface. A thermometer * * * was hung in the gallery or level where these were placed. * * * " These mines are in lat. 52° 8
Pagina 725 - Long. 43° 50' W., Lat. 19° 58' 20" S. Mine of Morro Velho* Elevation of the surface about 3,250 feet above the sea. Wrought in clay-slate. " If, in the absence of observations at midnight, and at 3 am, we assume the mean temperatures at those hours to have been 45°, which at this season cannot be wide of the truth ; we have an average of about 48°'5 during the twentyfour hours. " On the 11th of June the thermometer stood at 53°'8 in the shade at noon. „ „ 66°'8 „ sunshine „ . " On that...
Pagina 771 - Les observations que je viens de rapporter établissent, ce me semble, d'une manière certaine que la température moyenne d'un lieu abrité situé entre les tropiques, est donnée par la température du sol prise à 1 pied de profondeur. . Une fois que j'eus reconnu la possibilité* d'obtenir, par un moyen aussi prompt que facile, la température moyenne d'un lieu , j'emportais dans mes voyages un fleuret de mineur, à l'aide duquel je pratiquais aisément dans le sol...
Pagina 770 - Le thermomètre a été placé à i pied dans le sol , dans une salle basse de la maison du surintendant des mines. La température moyenne de celte maison déduite d'une année d'observations est de 20°,5.