Journal - South African Institute of Mining and Metallurgy . blows per minute. Here the rock wantedmore cutting, and, owing to the low pressurethere was no velocity on the hammer, thusthey could not bore well ; the number of blowsper minute was reduced also. Then all the otherdrill operators, except those connected with theGordon drill, were troubled with the supply of Oct. 190*3 E. M. Westi hi ills. II. suitable hollow steel, and even the latti i hadtrouble, 1 believe. G. Leyiwelded bits thai were alwa d the steel sent 1inin America for his small machii •also for the Eardsocg Wonder machine,
Journal - South African Institute of Mining and Metallurgy . blows per minute. Here the rock wantedmore cutting, and, owing to the low pressurethere was no velocity on the hammer, thusthey could not bore well ; the number of blowsper minute was reduced also. Then all the otherdrill operators, except those connected with theGordon drill, were troubled with the supply of Oct. 190*3 E. M. Westi hi ills. II. suitable hollow steel, and even the latti i hadtrouble, 1 believe. G. Leyiwelded bits thai were alwa d the steel sent 1inin America for his small machii •also for the Eardsocg Wonder machine, thoughreported to be satisi less here. Both these machines are hung up atpresent, partly for this cause, though l>th nwould, [ think, have to lengthen the stroke on theirmachines before they could be adapted for use no machine tried, except the water Leyner,had any suitable water feed attachment for usewith hollow steel, and here a hammer drill is use-less without water being led through hollowto the cutting edge of the drill bit. Fig. I\ .. sketch showing the arrangement of the fronthead, water feed device and anvil block ofthe Gordon drill. C is the cylinder wall. 11 isthe striking hammer. A is the anvil Mock. F 11is the front head in one piece : this latter has totake up and resist the blows of the hammer shouldthe steel not do so. WB is a hollow water ringsecured by the ring R and the lock nut L is the shank, and O the stem of the hollowdrill bit. Air is exhausted through A, andmeets the water coming from the ring along thehole P, and carries it down the hollowThe designers of the Gordon drill were in a ll id <MI thedecided tl rely 11 (which after all rnu Idouble the kin<the blow. Withoutmight have given trouble in I and in ! heir system the steel, and ii the anvilthe machine itself, claimed thatIof the .Murphy drill were alK\ their firsl failure, and they claimto have prodi simpler construction tha Ion drill, one that will Lore t\\ their former mac
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Keywords: ., bookcentury1800, booksubjectmetall, booksubjectmineralindustries
