GOLD MINING WITH A DREDGE
It is a dredge of this type that is put to the peculiar task of gold mining. The dredge eats its way into gold-bearing sands, the material passing through a system of separators which extract the gold and then being discharged at the rear of the dredge. The dredge floats in a pool of water that it carries with it, for as it excavates ahead it builds up sand banks behind. In this way it may travel far from the river from which it first started.
DIGGING A TRENCH WITH A CHAIN TYPE MACHINE
MULTIPLE PLOWING ON A WESTERN WHEAT FIELD—TURNING FIFTY FURROWS AT ONCE