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The number of times fan blades pass a given point per second; equals the number of blades in the fan […]

A shop where iron bars are forged into objects such as tools, and where horses are fitted with horseshoes.

Uncoated cold-rolled steel in sheets, usually 12 in. (30.5 cm) to 32 in. (81.3 cm) in width.

On a theater stage, a master switch that extinguishes all stage lights simultaneously.

Uncoated steel pipe, called black  because of the dark-colored iron-oxide scale formed on its surface; usually used for lowpressure