PARALLEL a.
), a metal rod that connects the crank pins of two or more driving wheels; -- called also couping rod, in distinction from the connecting rod. See Illust. of Locomotive, in App. -- Parallel ruler, an instrument for drawing parallel lines, so constructed as to have the successive positions of the ruling edge parallel t…
PIPE n.
ogether, or applies pipes, as to an engine or a building. -- Pipe fitting, a piece, as a coupling, an elbow, a valve, etc., used for connecting lengths of pipe or as accessory to a pipe. -- Pipe office, an ancient office in the Court of Exchequer, in which the clerk of the pipe made out leases of crown lands, account…
REDUCING n.
ce (Metal.), a furnace for reducing ores. -- Reducing pipe fitting, a pipe fitting, as a coupling, an elbow, a tee, etc., for connecting a large pipe with a smaller one. -- Reducing valve, a device for automatically maintaining a diminished pressure of steam, air, gas, etc., in a pipe, or other receiver, which is fed…