TEMPERATURE in the mines. GEOMETRIC DEGREES

How different are the results obtained at different times, show Beknalya coal mines in England: the temperature of coal at the time of exposure was 22 °, but ten months later, 15 ° C. The thermometer should invest as deeply as possible into the borehole to be drilled perpendicular to the surface of the rock, so drilling tsak develops heat, you have to wait until the hole has cooled again, and then carefully to protect the thermometer from the influence of the air. So you can watch if not entirely accurate temperature, then at least close to true. Numbers obtained in this way, find a lot of hesitation, but if you ignore those irregularities, very special is the distribution of heat in the famous copper mines in the Upper Lake in North America. Enormous accumulations of water, holding in its deepest parts of the temperature at 4 ° C, are cooling properly; like cold compresses, they absorb heat and lower the temperature of the mines: the closer to the lake are the last, the slower the temperature rise in them. Typically, geothermal degrees for GF mean = 16? 5 m in the same Ostseola mine, located 8 km from the lake, it rises to 23.3 meters and the mines that lie even closer - up to 30,5 m and even to 37,2 m. According to Wheeler (Wheeler), the cooling effect of water has already discreetly at a distance of 12 - 13 miles. Rich material for observations represent artesian wells: they enable us to determine the temperature, which has water at a certain depth. Compared with the mines of the wells are characterized by more accurate and more rapid rise in temperature with depth. The most important results of observations of this kind are given in the following table: drilling site achieved depth in meters water temperature geothermal degree Grenelle near Paris ........ 547 27,7 ° 32,6 C. Andre, near Paris ......... 523 - 30.7 Rudersdorf in Berlin ........ 696 33,6 ° 26,9 Neyzaltsverk (Westphalia )....... 671 34 ° 29,6 Rouen ............... - - 28,5 Mondorf ............. - - 28,6 Pittspul in Magdeburg. ,...... - - 25.1 La Rochelle ............ - - 19,0 Artern in Thuringia ......... - - 37,7 Bootle in Liverpool .......... 434.1 - 71.3 Scarle, Lincoln .......... 609 - 37.8 Kentish Towne ............ 307 - 36.8 Zudenburg in Magdeburg ........ 568 - 32.3 Zennevits at Halle .......... 1084 - 36.6 Lit at Altona ........... 1259 - 35 Sulz, on the banks of the Neckar ........ 710 - 1924