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Women preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Marti...
Women preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Martillo, Caaguazu, Paraguay, South America





Draining mine workings by means of a battery of three pumps. The axle, B, is powered by an overshot water wheel. The cams on ...
Draining mine workings by means of a battery of three pumps. The axle, B, is powered by an overshot water wheel. The cams on the axle raise and lower the piston rods by means of tappets. C is the bottom of the pipe which is encased in the basket, D. From De re metallica, by Agricola, pseudonym of Ge





Women preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Marti...
Women preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Martillo, Caaguazu, Paraguay, South America





Woman preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Marti...
Woman preparing the traditional dish Bory Bory in a simple kitchen on an open fire, soup with corn dumplings, Comunidad Martillo, Caaguazu, Paraguay, South America





Draining mine workings with a bank of three suction pumps. As the men turn the shaft the cams, B, connect with tappets. A, on...
Draining mine workings with a bank of three suction pumps. As the men turn the shaft the cams, B, connect with tappets. A, on the piston rods, C. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.





Three devices for ventilating mines with bellows. In the centre the horse turns the wheel and cams, I,I, work the bellows. At...
Three devices for ventilating mines with bellows. In the centre the horse turns the wheel and cams, I,I, work the bellows. At the top, a horse turns a crown wheel which engages with a lantern on the camshaft and the cams engage with tappets to work the bellows. At the bottom, a man works the bellows
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