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A pair of compasses having both legs terminating in points; used for measuring, transferring, or comparing distances between two points

Glass in a window or glazed door that is divided into smaller panes by secondary framing members; see muntin.

Same as Dutch door.

A valve (sometimes motorized) at a junction of a pipe tee; used to change the flow from one branch to

1. In an electric wiring system, the ratio of the sum of the individual maximum demands of the various subsystems