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"In street architecture a covered way or passage, either open at the side with a range of pillars, or completely covered over. The finest arcades of this description are to be found in Paris." — Encyclopedia Britanica, 1893

Arcade

"In street architecture a covered way or passage, either open at the side with a range of pillars, or…

A gate is a point of entry to a space enclosed by walls, or an opening in a fence.

Gate

A gate is a point of entry to a space enclosed by walls, or an opening in a fence.

A gate is a point of entry to a space enclosed by walls, or an opening in a fence. Gates may prevent or control entry, or exit or they may be merely decorative.

Wooden Locking Gate

A gate is a point of entry to a space enclosed by walls, or an opening in a fence. Gates may prevent…

Diagram showing passage of thrust fault into fold.

Thrust Fault into Fold

Diagram showing passage of thrust fault into fold.

A piece of laboratory equipment. It is a laboratory tube used much in the same way as a boiling tube except not being as large and thick-walled.

Ignition Tube

A piece of laboratory equipment. It is a laboratory tube used much in the same way as a boiling tube…