Clack Valve. This takes its name from the noise it makes in seating; it is made of leather with a metal weight on top, the leather forming a hinge on one side. In the cut the lifted valve is the “clack.”
Clack Valve.
Clearance. The space or distance by which one piece clears another. The space between piston and cylinder head.
Cock. A faucet or device for opening or closing a passage. The illustration shows a straight-way cock.
Plain Cock.
Column Pipe. A column may be considered as a beam set on end and a column pipe may, similarly, be defined as a pipe set on end. The pipes leading from a water column to boiler.
Compression Gauge Cock. A device having a threaded steam spindle and made tight by compression. The figure exhibits an outside view of a locomotive compression gauge cock.