ClipArt ETC
Most boilers consist of a rotating drum called a tumbler through which heated air is circulated to evaporate the moisture from the load. The tumbler is rotated relatively fast in order to maintain space between the articles in the load.

Clothes Boiler

Most boilers consist of a rotating drum called a tumbler through which heated air is circulated to evaporate…

A snow melting machine is a type of snow removal machine employed to melt snow as a means of snow removal.

Snow Melting Machine

A snow melting machine is a type of snow removal machine employed to melt snow as a means of snow removal.

This furnace is used to purify a gold concentrate. The gold concentrates, if non-pyritic, are treated in grinding pans in the bottom of which mercury is placed. The amalgam (mercury alloy), after squeezing out the excess mercury, is heated in the retort, to distil (separate) off the rest and leave the gold, which is then melted and cast into bars of gold bullion of varying fineness.

Retort Furnace for Gold Bullion

This furnace is used to purify a gold concentrate. The gold concentrates, if non-pyritic, are treated…