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"The Duplex is made in two equal parts, each being capable of being worked alone. Each section consists of a semicircle of upright tubes forming the boiler proper, fitted with the diaphragm a, horizontal pipes forming the furnace f, a flow pipe b and a return pipe c, and an outlet d for removing sedimentary deposits from the interior." — Encyclopedia Britannica, 1893

Duplex Tubular Boiler

"The Duplex is made in two equal parts, each being capable of being worked alone. Each section consists…

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.

"As the ball of wood is dropped into the container or water, the water level rises and is caused to flow into the bucket. The water in the bucket, once weighed, is equal to the weight of the wooden ball." —Quackenbos 1859

Water Displacement

"As the ball of wood is dropped into the container or water, the water level rises and is caused to…