Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . V XJ -M- v-^ ftj -p- > jTi Besides this, or in ]ilace of it, some tribes had hol-lowed sections of tree-trunks, as among the Jajian-ese of the present time. Throughout that countryrice is hummrhd in a wooden mortar. ware appears to fidfiU the requisitionsfor a good mortar better than any other substance,porjihyry exceiitefl. The gieat difficulty
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . V XJ -M- v-^ ftj -p- > jTi Besides this, or in ]ilace of it, some tribes had hol-lowed sections of tree-trunks, as among the Jajian-ese of the present time. Throughout that countryrice is hummrhd in a wooden mortar. ware appears to fidfiU the requisitionsfor a good mortar better than any other substance,porjihyry exceiitefl. The gieat difficulty in workingthe latter has been a bai to their introduction. TheFrench have made them as large as 29 inches indiameter. A mortar should be able to resist scratching bysteel, i]uartz, or flint. Should not be stained ifsuljihate of copper or muriate of iron be left in it fort«-ci;ty-four hours. Should not be abrad<-d by thenibbing down of an ounce of sharp sand to a finejimvder. The pestle should the .same char-acter. Mortars of iron, brass, marble, dolomite, and glassare acted on by particular solvents, especially acids. JIORTAE. 14 / I MORTAR. They are also too soft tor many jmrposes. The color-mortar b, used ill tl
Size: 2324px × 1075px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
