Besides the mineral resources of the world in their original state, the displays embraced many devices of mining machinery; such as pumps and engines used in mining, moving, and delivering ores; apparatuses for breaking out ore and coal; for crushing and pulverizing; for reducing metals, for instance the extraction of gold and silver by milling, Lixiviation, and fire; furthermore, boring and drilling tools; grinding and polishing substances, etc.
"By Water to the Columbian Exposition"
Johanna S. Wisthaler