Scientific American Volume 65 Number 20 (November 1891) . ition held in connection with the Montreal con-vention, and which attracted as much attention as anypart of the whole exhibit, was that of the Edison per-cussion and rotary mining drills. The accompanyingillustration shows these two machines at work. TheEdison percussion drill will bore at the rate of threeinches per minute in the hardest granite. It requiresbut little power to operate it, and, of course, can beworked at any reasonable distance from the dynamo,the limit suggested by the company being three drill is simple in c
Scientific American Volume 65 Number 20 (November 1891) . ition held in connection with the Montreal con-vention, and which attracted as much attention as anypart of the whole exhibit, was that of the Edison per-cussion and rotary mining drills. The accompanyingillustration shows these two machines at work. TheEdison percussion drill will bore at the rate of threeinches per minute in the hardest granite. It requiresbut little power to operate it, and, of course, can beworked at any reasonable distance from the dynamo,the limit suggested by the company being three drill is simple in construction, and there is nothingabout it that would be affected by moisture. Thediamond prospecting core drill, designed for locatingmineral deposits, was also shown. This machine willbore 150 feet into the earth, bringing out specimens ofmineral for the examination of the prospecting from this, the exhibit at Montreal included coaldrills, electric hoists, fans, and pumps for mining use,an indication that the Edison company is turning its. THE EDISON ELECTRIC ROCK DRILL. attention in a very practical way to this very import-tant application of electricity.—Electrical World. How to Manage a Semi-Dry Brick Press. Were I to take charge of a semi- dry brick press, be-fore I would start it, I would first examine it all overcarefully and see that there are not any loose bolts,broken cogs, or other breaks •or obstruction of anykind, such as blocks, cold chisels, ranches, etc., leftanywhere in the machine. I would examine the diesor moulds and see that the liners and moulds werewell bolted, see that the feed spout and the feed boxare clean, and no nails, wood, or any rubbish so naturalto brick yards, and brick yard carpentry and neglect,that would wedge under the feed box and break theguides or cams controlling those particular complica-ted parts when in operation. After I am satisfied thateverything is clear and in safe working order, I wouldsee that all the oil wel
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