ar knife for its particular purpose. cussion to show that mysterious agencies were suddenly The tool ordinarily used somewhat resembles a shoema- brought to bear upon the weak point, causing the break. ker's knife. It requires skill in its manipulation, and must The fact is the point of fracture… … discover; and we would advise all boiler owners to secure the present device requires sharpening but seldom, and it is the services of some competent man to examine their boilers in many respects a convenient and handy implement. carefully at least once a year.—J. M. Atten, President of Patented…
Patents · Improved · Drill · Boiler · Ether · Iron · Patent law · Scientific American · Pound sinker · Patent office · Cutting edges · Wrought iron · Trade mark · Small quantity · Tin foil · Lord chancellor
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