Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 464
then splitfrom its bed by meansof wedges. This underdrilling is called byquarrymen gadd-ing, and special ma-chines, which areknown as gaddingmachines, have beendesigned for the pur-pose. (See figures on pages 409 and 410). At the Vermont marble quarries both theSullivan diamond pointed drill and… … Fig. 7.—Wardwbll Channelling Machine. 39° STONES FOR BUILDING AND DECORATION. of the holes, must necessarily vary with the character of therift of the rock. (4) SANDSTONE QUARRYING. In the quarrying of the Triassic sandstones in Connecticut,the channelling machine is used to some extent, but…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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