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By Charles Singer et al (eds)

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On Mendip, calamine (zinc carbonate or silicate) was mined as early as 1560! The laws o f the High Peak o f Derbyshire have a character o f their own. M any o f the terms are identical with those o f Saxony; thus the head-man is a ‘barmaster’. F igure 10— Illustrations from the im iials o f a C astilian illum inated manuscript o f the thirteenth century. From left to right: prospecting fo r a ‘'stone which attracts lead and resembles it’ ; quarrying marble; collect­ ing gold from river sand; prospecting fo r iron with hammer and wedge.

Later, more than 2000 shafts were sunk, connected by galleries. It is noteworthy that there is practically no outcrop o f the lower and richer contact-zone, the discovery and working o f which were a matter for nineteenth-century inductive geology. T h e shafts are exceedingly regular; they are rectangular and usually about 1-9 X 1*3 m. T h e centre Ime is very accurately vertical, but at about every 10 m o f depth the cross-section is tiumed through an angle o f 8 to 10°, so that the rectangle at the bottom may be at right-angles to that at the top.

Enable the miners to breathe easily and carry on their work [30]. F igure 18— Horse-drawn sledge, and dogs with pack-saddles. ISS6. F igure 17— Horse-mhim fo r raising large loads. The man below operates a brake consisting o f a beam that can be lifted to bear on a drum fix ed to the driving shaft. The load may be held stationary by catching the chain on a suspended hook. 1SS6. These included sundry forms o f revolving fans, single- or double-acting bellows worked by hand or by machines similar to those already described (figure 22), and, finally, flapping with cloths.

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