Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 487
ly accom-plished by drilling a seriesof holes beneath it, andthen, by wedges, the blockis split from its bed. The machine is placedupon a platform on trucksarranged to run upon atrack. When adjusted for^ work it may be braced bythe pointed legs shown.The boring apparatus isattached by a swivel to… … Fig. 1$.—Diamond Channelling Machine. MACHINES AND IMPLEMENTS USED. 409 the purpose of boring a series of holes in a perpendicularline if desired. Upon the swivel the boring apparatus maybe turned, so as to bore in any direction within the planeof the swivel-plate. The illustration shows the…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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