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Title: Mine Pumping in Agricola's Time and Later

Author: Robert P. Multhauf

Release Date: January 20, 2010 [EBook #31024]

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[Pg 114]

MINE PUMPING IN AGRICOLA’S TIME AND LATER

The habit of heavy reliance on a single source for the substance of the history of Medieval and Renaissance mining techniques in Europe has led to a rather drastic over-simplification of that history, a condition which persists tenaciously in the recent accounts of Parsons, Wolf, and Bromehead.[1] Our preoccupation with Agricola, who has been well known to the English-language public since the Hoovers’ translation of 1912, seems to have inhibited the investigation of the development of the machines he describes so elegantly. More seriously, the opinion that mining techniques remained essentially the same for a century or two beyond his time appears to have hardened into a conviction.[2]

The history of the technology of mining, as distinguished from metallurgy, is largely a history of mechanization, and that mechanization has until the last century consisted principally in the development of what Agricola calls tractoriae—hauling machines. That hauling machines of some complexity, Archimedian screws and a kind of noria, were used by the Romans for dewatering mines has been known for some time. Evidence of the survival of this technology beyond the fall of Rome remains to be found, and it is generally agreed that mining activity declined through the first millenium. The revival and extension of mining in the central European areas of German settlement is thought to have occurred from the 10th century, with an intensive development of the region known to Agricola (Erzgebirge) in the 13th century.[3]

This revival appears to have paralleled in general the political and cultural revival, but, as in any mining region, the exhaustion of easily workable surface deposits marked a critical point, when the necessity of deeper mining led to the construction of supported tunnels and the introduction of machinery for removing ores and water from deep mines. On the basis of revisions of capital structure and mining law which he regards as inspired by the financial necessities of deep mining, Bechtel dates this development from the mid-14th century.[4] The mid-14th century situation is confused by the occurrence of the Black Death, which reduced mining activity drastically, and the events of which Bechtel speaks have been put as much as a century later.[5] In any case, the development of deep-mining methods had clearly made considerable progress in nonferrous mines when the De re metallica was written, in 1556.

[Pg 115]

Figure 1.—Brunswick Silver 3½ Taler, Johann Friedrich, 1677. (U. S. National Museum, Paul A. Straub coll.; Smithsonian photo 43334-C.)

For a detailed description of the mechanical equipment of this era we are largely indebted to Agricola. He classifies hauling machines into four types; the ordinary bucket windlass, the piston (suction) pump, the chain of dippers, and the rag and chain pump. Although the first three had been known in antiquity, and the last perhaps a century before his time,[6] their[Pg 116] use in mining would appear to date from the mid-14th century or later. His is not an historical account, and one who attempts to compare it with others of contemporary or later times encounters a difficulty in his use of descriptive Latin names rather than the common German names used by most others. English and German editors have interpreted them as follows:[7]

Figure 2.—Brunswick Silver 1½ Taler, Ernst August, 1688. (U. S. National Museum, Paul A. Straub coll.; Smithsonian photo 43334-A.)

Figure 3.—Brunswick Silver 4 Taler, Ernst August, 1685. (U. S. National Museum, Paul A. Straub coll.; Smithsonian photo 43334-A.)

[Pg 117]

Figure 4.—Medal, 1690, Showing St. Anna Mine, near Freiberg. (Photo courtesy of Stadtisches Museum, Braunschweig.)

Figure 5.—Reverse of Medal shown in figure 4. (Photo courtesy of Stadtisches Museum, Braunschweig.)

The resemblance of the German term for bag (Bulge) to the Latin term for bucket (bulga) instead of the Latin term for bag (canalis), and the presence of buckets (Kübeln), bags (Bulgen), pockets (Taschen), or cans (Kannen) as components of three of Agricola’s four categories of hauling machines are reasons enough for the apparent superfluity of German names, if not for his decision to avoid the use of German names. But it should also be noted that the names sometimes refer to a pump and its prime mover considered as a single machine. Such is the case with the Kehrrad, a bucket windlass driven by a reversible waterwheel which Agricola describes as his largest hauling machine.[10]

Agricola describes 23 hauling devices of these four types, the diversity resulting generally from the application of three types of prime movers, men, horses, and waterwheels, and in the endowment of each in turn with a mechanical advantage in the form of gearing.[11] Although he does not specify clearly the relative importance of the various pumps, the majority (13) use man as the prime mover. He speaks of the advantages of some, noting that the horse whim has a power two and a half times that of the man windlass, and emphasizing the even greater power available in flowing water “when a running stream can be diverted to a mine.” The most powerful machine then in use for deep mines appears to have been the horse-powered rag and chain pump.

Such, then, were the important mining machines of this early period of deep mining, according to the leading authority. But did they continue, as has been claimed, to be the only important machines of the subsequent century? G. E. Lohneyss,[12] writing a little over a half century after the publication of De re metallica, declared:

Figure 6.—Stangenkunst, Showing Driving Wheel, Feldkunst, and Kunstkreuz. From H. Calvör (see footnote 15).

The Stangenkunst, which can be roughly translated as “rod work with crank,” was a piston pump driven through a crank and rods by a prime mover located at a distant point. Agricola describes a crank-driven piston pump, calling it a new machine invented ten years earlier.[13] But it is not driven bya distant prime mover. Like his other water-powered hauling machines it can only be used “when a running stream can be diverted to a mine.” So far as we can determine from internal evidence, Agricola did not know the Stangenkunst.

Although the full development of the Stangenkunst came later, it was apparently introduced in Agricola’s time. Its introduction to the Erzgebirge has been put as early as 1550.[14] According to another authority it was introduced to the Harz in 1565 by one Heinrich Eschenbach of Meissen.[15] Its significance is only made clear to us by later authorities. As shown in figure 3 it was adapted to the utilization of a distant stream, through the Feldstangen, an extended horizontal series of reciprocating rods, and the Kunstkreuz (fig. 6), a lever in the shape of a cross for changing at right angles the direction of power transmission. These improvements may have been almost contemporaneous with Agricola, as Calvör[Pg 119] mentions the use of the Feldkunst, which term signified the extended rods, as having been known in 1565.

The disadvantage of moving the weight of a long extension of rods was obviated, during the 17th century, through the use of a double set of balanced rods, resembling a pantograph. At some later date the horse whim was fitted with a crank and adapted to the Stangenkunst,[16] thus permitting the establishment of a veritable power network, as suggested in figure 1.

The Freiberg mine director Martin Planer reported in 1570 the installation since 1557 of thirty-eight “Kunsten und Zeugen” in mines under his charge. That these were water-powered machines is clear from his remark that their cost was only 10 to 20 percent that of “Pferden und Knechten.”[17] It is likely that many if not most were Stangenkunsten, for mining treatises of the 17th and 18th centuries testify to the continuous extension of this mechanism.[18]

Perhaps the most striking evidence of its importance is its representation on the illustrated coinage of the 17th century. These multiple talers (figs. 1, 2, 3), happy products of the ingenious fiscal policies of the Dukes of Brunswick, picture mining activity in the 17th century no less elegantly than do the woodcuts of De re metallica a century earlier. The Stangenkunst received its most spectacular application in France, in its application to the driving of the second- and third-stage pumps in the famous waterworks at Marly (1681-88), but its real importance is better illustrated in central Europe, by the many descriptions and drawings showing its use in the mines, driving machinery as distant as a mile[19] from the source of power.

Figure 7.—Feldgestange (Stangenkunst) Near Lautental. From C. Matschoss, Technische Kulturdenkmal, Munich, 1932.

It seems, therefore, that Lohneyss’ “old miners” were those described by Agricola, and that the mine-hauling machinery used in central European mines changed in the century after him far more than has been recognized.[20] This thesis may further cast some light on other technological questions. The[Pg 120] connection between the urgency of the problem of mine drainage in England, and the invention of the steam engine, has often been suggested.[21] Perhaps the “backwardness” of Germany in steam-engine experimentation, and later in the introduction of the Newcomen engine, was to some extent due to the adequacy of existing machinery to meet the problem of mine flooding, for it is not clear that this problem existed on the continent.[22]

Figure 8.—The Waterworks at Marly-le-Roi, on the Seine River, Built in 1684 to Supply the Fountains at the Royal Palace at Versailles. From a print by de Fer, 1705. (Smithsonian photo 45593.)

A comparison of the techniques described by Agricola with those of a century later suggests that this was a century of significant progress in that earlier industrial revolution described by Mumford as his “Eotechnic phase,” characterized by “the diminished use of human beings as prime movers, and the separation of the production of energy from its application and immediate control.”[23]

Footnotes:

[1] W. B. Parsons, Engineers and engineering in the Renaissance, Baltimore, 1939. Abraham Wolf, A history of science, technology, and philosophy in the 16th and 17th centuries, New York, 1935; and A history of science, technology and philosophy in the eighteenth century, London, 1938. C. M. Bromehead, “Mining and quarrying to the seventeenth century,” in Charles Singer and others, A history of technology, vol. 2, Oxford, 1956.

[2] According to Parsons (op. cit., footnote 1, p. 629) the introduction of machinery worked by animals and falling water, “radical improvements” of the 15th century, fixed the development of the art “until the eighteenth, and, in some respects, even well into the nineteenth century.” Wolf in his History of science ... in the eighteenth century (p. 629, see footnote 1) agrees, saying that “apart from [the steam engine] mining methods remained [during the 18th century] essentially similar to those described in Agricola’s De re metallica.” Bromehead (op. cit., footnote 1, p. 22), in referring to the date 1673 also sees “no appreciable change in methods of mining since Agricola.”

[3] Parsons, op. cit. (footnote 1), p. 179. T. A. Rickard, Man and metals, New York, 1932, vol. 2, pp. 519-521.

[4] Heinrich Bechtel, Wirtschaftstil des deutschen Spätmittelalters, Munich, 1930, pp. 202-203. Bechtel calls this one of the most revolutionary industrial developments of the middle ages.

[5] Rickard (op. cit., footnote 3, pp. 547-554, 561) also speaks of a decline through the exhaustion of surface deposits, but dates the revival 1480-1570. He supports this conclusion by statistics on the leading mine at Rammelsberg, which was unproductive from the Black Death (1347) to 1450, and only slightly active before 1518.

[6] According to F. M. Feldhaus (Die Technik, Leipzig and Berlin, 1914, p. 833.), a manuscript illustration of this type of pump, which he calls Schöpfkolbenkette, appears in the Mariano Codex latinus 197, B. 180, dated 1438, in the Munich Hofbibliothek.

[7] Based on a comparison of the following editions of Agricola, De re metallica: Froben, Basel, 1556 (in Latin; the first edition); The Mining Magazine, London, 1912 (English translation by H. C. and L. H. Hoover); VDI, Berlin, 1928 (German translation by Carl Schiffner).

[8] The emergence of the term Kunst in German mining terminology is connected with the application of water power, especially to pumping (see Heinrich Veith, Deutsches Berg-wörterbuch, Breslau, 1870, article “Kunst”).

[9] According to Veith (op. cit., footnote 8, p. 306), B. Rössler, in his Speculum metallurgiae politissimum (Dresden, 1700, p. 41) says that the Taschenkunst (pocket-work) was used with a pipe, like the rag and chain pump, and the translator of the German (1928) edition of De re metallica also uses Heinzen and Taschen interchangeably. Calvör and others, however, seem to use Taschenkunst for the ordinary chain of dippers, which seems better suited to its literal meaning.

[10] Agricola, op. cit. (footnote 7), ed. Hoover, p. 199. His contemporary and fellow-townsman Mathesius equates the Kehrrad to the Bulgenkunst (Sarepta, p. 145, Nurnberg, 1571). According to Veith (op. cit., footnote 8, p. 286), Sebastian Münster in his Cosmographei ... (p. 381, Basel, 1558), had previously mentioned its use in the mines of Meissen; and its introduction has been put as early as 1500 by Otto Vogel (“Christopher Pohlem und seine Beziehungen zum Harzer Bergbäu,” Beiträge zur Geschichte der Technik und Industrie, 1913, vol. 5, p. 324.)

[11] Agricola, op. cit. (footnote 7), ed. Hoover, pp. 160-199.

[12] G. E. Lohneyss, Bericht von Bergwerken, 1619?, n. p., p. 3.

[13] Agricola, op. cit. (footnote 7), ed. Hoover, pp. 184-185. The crank was centuries old at this time, and had been applied to pumping earlier than the time mentioned by Agricola, although perhaps not in mining. A drawing dated 1405 shows an Archimedian screw turned by a crank (Feldhaus, op. cit., footnote 6, p. 834). The Mittelalterliche Hausbuch (ed. H. T. Bossert and W. F. Storck, Leipzig, 1912, Tafel 32), a German description of technology that appeared in 1480, shows an arrangement very like that described by Agricola, although not in mining service.

[14] O. Fritsche and A. Wagenbreth, “Die Wasserhaltungs-maschinen bei Agricola und sein Einfluss auf ihre weitere Entwicklung,” in Deutsche Akademie der Wissenschaft zu Berlin, Georgius Agricola, (East) Berlin: Akademie Verlag, 1953, p. 112.

[15] Hennig Calvör, Acta historico-chronologico-mechanica circa Metallurgiam ..., Braunschweig, 1763, pp. 36-37.

[16] I have been unable to find an early reference to this innovation, which appears in a sketch of 1784-85 illustrating Conrad Matschoss’, “Die Maschinen des deutschen Berg- und Hüttenwesens vor 100 Jahren,” Beiträge zur Geschichte der Technik und Industrie (1909), Band I, p. 7. Its introduction may be connected with the appearance of the term Rosskunst for the horse windlass, known earlier as the Göpel.

[17] “Bericht des Bergverwalters Martin Planer über den Stand des Freiberger Bergbaues im Jahre 1570,” ed. R. Wengler, Mittheilungen Freiberger Altertumsverein, 1898, vol. 35, pp. 75-83.

[18] The description of the Stangenkunst in its various modifications is one of the chief topics of the previously cited work of Calvör (footnote 15), and from his and other references it is clear that the subject was also treated extensively by such earlier writers as Lohneyss (1617) and Rössler (1700).

[19] Fritsche and Wagenbreth, op. cit. (footnote 14), p. 112.

[20] The hauling of ores, as opposed to water, seems to have remained as shown by Agricola until the end of the 17th century. In 1694, however, the famous Swedish engineer Christopher Polhem built at Falun a water-powered conveyer system which brought the ore from the point of origin in the mine to the smelter in a single operation, terminating with the automatic unloading of the buckets (Vogel, op. cit., footnote 10, p. 306).

[21] Dickinson, H. W., A short history of the steam engine, New York, n. d., p. 3.

[22] In 1673 Edward Browne visited Hungary and the Erzgebirge. His report on the trip, A brief account of some travels in diverse parts of Europe (2nd ed., London, 1685, p. 170), says little about machinery, but does not mention flooding as a serious problem. Of an 84-fathom mine called Auff der Halsbrucker, near Freiberg, he says “they are not so much troubled with water, and have very good engines to draw water out.” Yet the chain of dippers and rag and chain pump were evidently fallen into disuse, as they do not appear among the mining machines reported by Fritsche and Wagenbreth as having been described by Lohneyss (1617) or Rössler (1700); and Fritsche and Wagenbreth declare that German hydraulic machinery was able to compete with the steam engine in mine dewatering for some time into the 19th century (op. cit., footnote 14, pp. 111, 112).

[23] Lewis Mumford, Technics and civilization, New York, 1934, p. 112.

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