Ivo ow COMPARATIVE ACCURACY OF MERCURIAL AND ANE ROID BAROMETERS. ment not easily broken readily transported and very ser FAIR OF THE AMERICAN INSTITUTE. the guard is drawn down is such as to form an inclined plane sloping towards the breech of the barrel and the groove on its upper surface corresponding precisely with the bore of the gun facilitates the entrance of the cartridge so that it slides directly into its proper position without the necessity of looking to see that it is properly inserted. The removal of the empty cartridge is effected by the action of an elbow lever which throws it out the instant the guard is lowered. This lever derives its power from the action of the breech block itself and is not dependent upon any spring Ward & Co. 57 Wall street New York show a case of the, scientific american, 1870-10-15
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