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1 Mines Inspectorate
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2 mines inspectorate
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3 Mines Inspectorate
Горное дело: Горнотехническая инспекция (Англия) -
4 Mines inspectorate
Горное дело: Горнотехническая инспекция (Англия) -
5 mines inspectorate
Горное дело: Горнотехническая инспекция (Англия) -
6 mines inspectorate
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7 mines inspectorate
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8 Mines and Quarries Inspectorate
Englisch-Deutsch Fachwörterbuch der Wirtschaft > Mines and Quarries Inspectorate
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9 sanitary inspectorate
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10 Oeynhausen, Karl von
SUBJECT AREA: Mining and extraction technology[br]b. 4 February 1795 Grevenburg, near Höxter, Germanyd. 1 February 1865 Grevenburg, near Höxter, Germany[br]German mining officer who introduced fish joints to deep-drilling.[br]The son of a mining officer, Oeynhausen started his career in the Prussian administration of the mining industry in 1816, immediately after he had finished his studies in natural sciences and mathematics at the University of Göttingen. From 1847 until his retirement he was a most effective head of state mines inspectorates, first in Silesia (Breslau; now Wroclaw, Poland), later in Westphalia (Dortmund). During his working life he served in all the important mining districts of Prussia, and travelled to mining areas in other parts of Germany, Belgium, France and Britain. In the 1820s, after visiting Glenck's well-known saltworks near Wimpfen, he was commissioned to search for salt deposits in Prussian territory, where he discovered the thermal springs south of Minden which later became the renowned spa carrying his name.With deeper drills, the increased weight of the rods made it difficult to disengage the drill on each stroke and made the apparatus self-destructive on impact of the drill. Oeynhausen, from 1834, used fish joints, flexible connections between the drill and the rods. Not only did they prevent destructive impact, but they also gave a jerk on the return stroke that facilitated disengagements. He never claimed to have invented the fish joints: in fact, they appeared almost simultaneously in Europe and in America at that time, and had been used since at least the seventeenth century in China, although they were unknown in the Western hemisphere.Using fish joints meant the start of a new era in deep-drilling, allowing much deeper wells to be sunk than before. Five weeks after Oeynhausen, K.G. Kind operated with a different kind of fish joint, and in 1845 another Prussian mining officer, Karl Leopold Fabian (1782–1855), Director of the salt inspectorate at Schönebeck, Elbe, improved the fish joints by developing a special device between the rod and the drill to enable the chisel, strengthened by a sinker bar, to fall onto the bottom of the hole without hindrance with a higher effect. The free-fall system became another factor in the outstanding results of deep-drilling in Prussia in the nineteenth century.[br]Principal Honours and DistinctionsHonorary PhD, University of Berlin 1860.Bibliography1824, "Über die geologische Ähnlichkeit des steinsalzführenden Gebirges in Lothringen und im südlichen Deutschland mit einigen Gegenden auf beiden Ufern der Weser", Karstens Archiv für Bergbau und Hüttenwesen 8: 52–84.1847, "Bemerkungen über die Anfertigung und den Effekt der aus Hohleisen zusammengesetzten Bohrgestänge", Archiv fur Mineralogie, Geognosie, Bergbau und Hüttenkunde 21:135–60.1832–3, with H.von Dechen, Über den Steinkohlenbergbau in England, 2 parts, Berlin.Further Readingvon Gümbel, "K.v.Oeynhausen", Allgemeine deutsche Biographie 25:31–3.W.Serlo, 1927, "Bergmannsfamilien. Die Familien Fabian und Erdmann", Glückauf.492–3.D.Hoffmann, 1959, 150 Jahre Tiefbohrungen in Deutschland, Vienna and Hamburg (a careful elaboration of the single steps and their context with relation to the development of deep-drilling).WK -
11 Pötsch, Friedrich Hermann
SUBJECT AREA: Mining and extraction technology[br]b. 12 December 1842 Biendorf, near Köthen, Germanyd. 9 June 1902 Dresden, Germany[br]German mine surveyor, inventor of the freezing process for sinking shafts.[br]Pötsch was the son of a forest officer and could not easily attend school, with the consequences that it took him a long time to obtain the scholarly education needed to enable him to begin work on a higher level with the mining administration in the duchy of Anhalt in 1868. Seven years later, he was licensed as a Prussian mining surveyor and in this capacity he worked with the mining inspectorate of Aschersleben. During that time he frequently came across shafts for brown-coal mines which had been sunk down to watery strata but then had to be abandoned. His solution to the problem was to freeze the quicksand with a solution of chloride; this was better than the previous attempts in England to instal cooling coils at the bottom of the shaft. Pötsch's conception implied the construction of ice walls with the means of boreholes and refrigerators. By his method a set of boreholes was driven through the watery strata, the smaller pipes contained within the main bore pipes, providing a channel through which calcium chloride was pumped, returning through the longer pipe until the ground was frozen solid. He obtained a patent in 1883 and many leading international journals reported on the method the same year.In 1884 he established the Internationale Gesselschaft für Schacht-, Brucken-und Tunnelbau in Magdeburg and he also became Director of the Poetsch-Sooy-Smith Freezing Company in New Jersey, which constructed the first freezing shaft in America in 1888.However, Pötsch was successful only for a short period of time and, being a clumsy entrepreneur, he had to dissolve his company in 1894. Unfortunately, his decision to carry out the complete shaft-sinking business did not allow him to concentrate on solving upcoming technical problems of his new process. It was Louis Gebhardt (1861–1924), his former engineer, who took care of development, especially in co-operation with French mining engineers, and thus provided the basis for the freezing process becoming widely used for shaft-sinking in complicated strata ever since.[br]Bibliography1886, Das Gefrierverfahren. Methode für schnelles, sicheres und lotrechtes Abteufen von Schächten im Schwimmsande und uberhaupt im wasserreichen Gebirge; für Herstellung tiefgehender Bruckenpfeiler und für TunnelBauten in rolligem und schwimmendem Gebirge, Freiberg.1889, Geschichtliches über die Entstehung und Herausbildung des Gefrierverfahrens, Magdeburg.1895, Das Gefrierverfahren und das kombinierte Schachtabbohr-und Gefrierverfahren (Patent Pötsch), Freiberg.Further ReadingD.Hoffmann, 1962, AchtJahrzehnte Gefrierverfahren nach Putsch, Essen: Glückauf (the most substantial biography; also covers technological aspects).G.Gach, 1986, In Schacht und Strecke, Essen: Glückauf, pp. 31–53 (provides information on the development of specialized mining companies in Germany originating in the freezing process).WKBiographical history of technology > Pötsch, Friedrich Hermann
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