BU1LDI^'G A\]^ ORNAMENTAL STONES. 



323 



made iuljii.stable iit any angle — to tlie riji'Ut, left, Ibrward, (tr backward. 

 The macliine is thus capable of making" transverse and sideliill cuis, 

 and does what is known as "cutting out the corners" in ({uarrying; and 

 (o) it can be used in chambers where the distance between the floor and 

 roof is but G feet and can be used in tunnels and headings. 



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Saiiiuk'is f-'haiiueliii^ !Machine makiua; side? ; 



I with boilti-.s (l(;ta(;bcil. 



The machine carries five drills in the gang, with three straight points 

 and two. diagonal ones. These are arranged as seen in the accompany- 

 ing cut; 



Q^rt^ ef i2i'2hi 



^liiii'S tfgt^n^^ 



The average capacity of the machine, as claimed by the company's 

 circuhir, is as foHows : 



III iii;irl)le, 80 to 100 .s(|iiaro feet of cbannol in teu hours. 



Ill saiidstoiio, 150 to ^00 S((uaro feet of channel in ten hours. 



In limestone, I'JO to 150 square feet of channel in ten hours. 



The diamond channeling machine is shown in the liguic on page 324. 

 According to the com[)any's circular this machine einph^ys l;|-inch drill- 

 bits, which are attached to drill-rods of varying lengths, adapted to any 

 required depth of channel up to OJ feet. The channel may be made open 

 or partly closed, the latter by leaving slight si)aces between the holes, 

 to be afterward chipped out. But the whole operation of a clear cut 

 is made simultaneously with the boring by means of an intercutting 

 guide, which answers this purpose very well. The drill can be made to 



