BUILDING AND ORNAMENTAL STONES. 



323 



made adjustable at any angle-to the right, left, forward, or backward. 

 The machine is thus capable of making transverse and sidehill cuts 

 and does what is known as "cutting out the corners" in quarrying; and 

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

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



Saunders ChMnding Machine making sidehill ents and with hollars detached 



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

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



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



circular, is as follows : 



In marble, SO to 100 square feet of channel in ton hours 

 In sandstone, 150 to 200 square feet of channel in ten hours 

 In limestone, 120 to 150 sqnare feet of channel in ten hours' 



The diamond channeling machine is shown in the figure on page 3*4 

 According to the company's circular this machine employs if. inch drill-' 

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

 required depth of channel up to 9} feet. The channel may be made open 

 or partly closed, the latter by leaving slight spaces between the holes, 

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

 h made simultaneously with the boring by means of an intercutting 

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



