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They look soft and yielding, but are often possessed of unexpectedly abrasive roots. Besides, they mask the face of the ground. When you have finished pulling them up by the roots, you will find that your supposedly level plot is knobby with hummocks. Stand directly over each little mound; swing the back of your axe vigorously against it, adze-wise, between your legs.
Care must be taken to so distribute the abrasive material as to grind mostly on the places where the plug fits tightly. =Sealing on a New Tube.= It frequently happens that one of the tubes of the stopcock is broken off close to the cock itself, and a new one must be joined to the stub of the old one.
Carborundum, a silicide of carbon, is a valuable substance produced by the action of the heat of an electric furnace on an intimate mixture of carbon and sand. It has an extensive use as an abrasive for grinding and polishing. Artificial graphite is another product produced by the long-continued action of the heat of the electric furnace on carbon under certain conditions.
But the change would be infinitely less than trimming off the rotors' rims. If they spun the rotors and used an abrasive on the high side of the shaft as it turned.... "Going to have precession!" warned Mike. "Have to have a polishing surface. Quarter turn behind the cutter. That'll hold it." Joe only remembered afterward to be astonished that Mike would know gyro theory.
It is produced by the use of a simple electric furnace of the resistance type, where coke, sand, and sawdust are heated to a temperature of between 2000 degrees and 3000 degrees C. The chemical reaction involves the production of carbon monoxide, and gives a carbide of silicon, a crystalline solid which has the excellent abrasive properties mentioned.
Legal letters, political letters, business letters requests for his autograph, for his help, for his advice a challenge from a Presbyterian minister in the north of Scotland to meet him in debate; the like from a Unitarian in Norfolk; a coffin and some insulting verses in a match box, and lastly an abrasive letter from a clergyman, holding him responsible for some articles by Mr.
Acheson, of Pittsburg, while so engaged, and in obtaining graphite from coal by the heat of an electric furnace, discovered that combination of silicon and carbon now known as carborundum, which has commercial value as an abrasive." "I know about that," bowed Nick.
Every evening Saleratus Bill took the candle and departed, leaving Bob to find his own way to his bunk. This was the time to cut his bonds; if at all. Unfortunately Bob could find nothing against which to cut them. Saleratus Bill had carefully removed every abrasive possibility in the two rooms.
In our country when coined it has, like paper money, been given a value equal to gold. The diamond has a value far exceeding that of gold, but this value is dependent almost wholly upon its ornamental properties, although the brilliant stone is also useful as an abrasive and cutting agent.
Sometimes Spike returned from these sorties unscathed and with money. Oftener he came back without money and with a face from abrasive thrusts looking as if a careless golfer had gone over him and neglected to replace the divots. After these times there were likely to follow complicated episodes of dentistry at the office of Doctor Patten.
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