er barrel iscut away to admit ofthe smaller one tak-ing its place. Theinner barrel radiatesfrom the breech,andis elevated or depressed by a screw.The principle of theinvention is that,while the outer bar-rel i» elevated tostrike the target atthe line of resist-ance, the inner bar-rel, or tester,… … Lubricating oil has at last rewarded some perseveringwell borers at Terre Haute, Ind. The auger was driven1,636 feet into the earth. In the London Central Telegraph Station, two lathes cutthe paper for the Wheatstone and Morse printing instruments.These lathes, working nine hours daily, cut 750…
Patents · Iron · Boiler · Boilers · Scientific American · Consists · Forty square · Steam safe · Horse power · Second hand · Heating surface · Head block · Sulphuric acid · Address munn · Steam boiler
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