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 . sup- < • rport when an observation \is to be made, as shown inFig. 3241. The cistern hasa Hexible leathern bottomresting upon the tlat upperextremity of a screw, bywhich it may be raised orlowered until the level ofthe mercury in the cisterncorresponds with the zeroof the scale. The tube isinclosed in a brass case, theupper part of wliich is par-tially open,
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 . sup- < • rport when an observation \is to be made, as shown inFig. 3241. The cistern hasa Hexible leathern bottomresting upon the tlat upperextremity of a screw, bywhich it may be raised orlowered until the level ofthe mercury in the cisterncorresponds with the zeroof the scale. The tube isinclosed in a brass case, theupper part of wliich is par-tially open, so as to exposeto view the mercurial col-umn, the lower part con-taining a graduations commenceat 15 inclies, are carried upto 33 inches, above tliezero point, and are subdi-vided so as to read tothousandths of an inchhy means of a veniier. M o u n t a of spongy, elastic va-riety of asbestus ;light enough to tioatin water. Mountain-gr^SQ -^ carbo-nate of coppercombined withwhite earth. Mountain-hcwit-zer. Aliglit field-piece,of large caliber in proportion to Moun,,mu,. Its weight. It is mounted on a light carriage which ujay beby one horse. Kg. Irawn
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
