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"Hot-wire instruments working on the sag principle can be used in any position if properly contructed, and are very portable." —Encyclopedia Britannica, 1910

Hot-wire Ammeter

"Hot-wire instruments working on the sag principle can be used in any position if properly contructed,…

A hot air balloon used for transportation.

Balloon

A hot air balloon used for transportation.

A storm composed of sand. It occurs when the air over the sand becomes hot, and rises. The differences in air pressure and temperature allow the cooler winds to rush in.

Dust Storm

A storm composed of sand. It occurs when the air over the sand becomes hot, and rises. The differences…

A group of people pointing at a hot air balloon in the distance.

Hot air balloon

A group of people pointing at a hot air balloon in the distance.

A type of furnace for smelting metal ore.

Hot Blast-furnace

A type of furnace for smelting metal ore.

"Hotbeds may be heated by means of either steam or hot water. They can be piped from the heater in a dwelling-house or greenhouse." — Baily, 1898

Pipe-heated hotbed

"Hotbeds may be heated by means of either steam or hot water. They can be piped from the heater in a…

Man tips hat

Man

Man tips hat

"The sweating blacksmith here is seen to stand / Beside his forge, with hammer in his hand, / And while the fiery sparks are flying far, / With might and main he strikes the red-hot bar." —Barber, 1857

Strike While the Iron is Hot

"The sweating blacksmith here is seen to stand / Beside his forge, with hammer in his hand, / And while…