Ketch
a two-masted vessel of the galliot type, usually from 100 to 250 tons burden. Ketches were formerly of ten used as yachts, also as bomb-vessels.
KEUPER (koi'per), the name given in Germany to a series of beds constituting the uppermost of the three series of strata from which the Trias derives its name. In Württemberg it is about 1,000 feet thick. Alberti divides it into limestone, gypsum, and carbonaceous slate clay. The Keuper is represented in England by saliferous and gypseous shales and marls, and in France by Marnes Irisées. The Keuper sandstones, especially the lower ones, afford good building stones. They are a pale red, yellow or white, and have been largely used in the cathedrals of Worcester and Chester.