E/MJ : engineering and mining journal . ers, but nobottom bushing- are available. When the bottom bushingwear and become loose, it is not necessary to buy a new cylinder costing $13. A new bushing is cheaply made ina lathe ami brazed into the lower end of the feed air-drill repairman who i- constantly on the look-out can repair enough worn and broken parts to cut repaircosts in two. It should be borne in mind, however, thatthe use of any old part that delays the operator or reducesdrilling efficiency is poor economy. By F. T. Teddy* ?ffimi®EeG I have found the track-grade temple!
E/MJ : engineering and mining journal . ers, but nobottom bushing- are available. When the bottom bushingwear and become loose, it is not necessary to buy a new cylinder costing $13. A new bushing is cheaply made ina lathe ami brazed into the lower end of the feed air-drill repairman who i- constantly on the look-out can repair enough worn and broken parts to cut repaircosts in two. It should be borne in mind, however, thatthe use of any old part that delays the operator or reducesdrilling efficiency is poor economy. By F. T. Teddy* ?ffimi®EeG I have found the track-grade temple! herein describedand shown to serve admirably the purpose for which it wasdesigned, particularly because of the adjustable featureembodied in it. As the illustration indicates, it is madefrom I1 (-in. material such as yellow pine. The ends areprotected from wearing by strap-iron shoes, the holes in which arc countersunk to receive the w 1-screws that r-ecure them in place. One of these is bent around the end . Hexagonal Head Screw, i*9. A CONVENIENT TRACKLAYIXG TEMPLET of the templet iii order that the nut of the adjustingscrew may be held in place. Inexpensive level-bubblesmay be easily procured, and one of these can be securedin a recess in the wood by means of plaster of paris. In use all that is necessary in order to establish anydesired grade is to extend the screw through the necessaryamount. Thus for a 1% grade the screw is extendedthrough 1 in., for a .)r, grade, 2 in., etc. A screw thaiwill admit an extension of 3 in. is sufficient for all ordi-nary purposes. While ibis idea does not follow strict1;,the trigonometric principle. T believe it is sufficiently closefor all practical purpose-. Sailors are renowned for their ability to change shipquickly and with the least amount of baggage. They usu-ally have a chest and a ditty bag and thats all. The latterpiece of baggage is interesting to the engineer it fits into his scheme of mobile equipment
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
