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A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications. The pressure vessel in a boiler is usually made of steel.

Closed Vessel Boiler

A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits…

"Alternating current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

Cooper-Hewit Mercury Vapor Lamp

"Alternating current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

"Direct current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

Cooper-Hewit Mercury Vapor Lamp

"Direct current self starting Cooper-Hewit mercury-vapor lamp." —Croft 1917

This vapor creating machine was used for medicinal purposes.

Vapor Machine

This vapor creating machine was used for medicinal purposes.

An invention by Edison used to see if chemical vapors could change a strip of rubber.

Odorometer

An invention by Edison used to see if chemical vapors could change a strip of rubber.

A vessel in which water is turned into steam by the process of boiling.

Boiler, Steam

A vessel in which water is turned into steam by the process of boiling.

"A "still;" and, for condensing the vapor, vats are constructed, holding serpentine pipes or "worms," which present a greater condensing surface than if the pipe has passed directly through the vat." —Wells, 1857

Still

"A "still;" and, for condensing the vapor, vats are constructed, holding serpentine pipes or "worms,"…

"The sulphur is then further purified by heating it in iron vessels (retorts) without access of air, until it is vaporized. the vapor is led into brick-lined rooms. A part of the gas is suddenly cooled and is deposited as a fine powder on the sides of the room. The form is known as flowers of sulphur. Most of the sulphur vapor condenses in the liquid form, and flows down to the outlet of the condensing chamber." -Brownlee 1907

Sulfur Purification

"The sulphur is then further purified by heating it in iron vessels (retorts) without access of air,…

"To the end of the delivery-tube of a Florence flask containing water, attach a 'trap' so that the water that condenses in the delivery-tube may be retained in the trap." — Avery, 1895

Trap

"To the end of the delivery-tube of a Florence flask containing water, attach a 'trap' so that the water…