|
Boiler glossary Q |
|
| |
||
| QUADRANT -- A slotted segmental guide through which an
adjusting lever works. It is provided with means for locating the lever in any
desired angular position. See link-motion. QUADRUPLE-EXPANSION ENGINE -- A steam engine in which the steam is expanded successively in four cylinders of increasing size, all working on the same crankshaft. Occasionally with two low-pressure cylinders. Consequently five cylinders but expansion in four steps. QUALITY CONTROL -- A form of inspection involving sampling of parts in a mathematical manner to determine whether or not the entire production run is acceptable, a specified number of defective parts being permissible. QUARTER -- The upper part of a vessel's sides near the stern. QUICK-BREAK SWITCH -- A switch having a spring or other device to produce a quick break, independently of the operator. QUICK-REVOLUTION ENGINES -- A term formerly applied to high-speed steam-engines direct-coupled to generators. |
© 2007 Lars Josefsson Boilers