A treatise on architecture and building construction . uble-headed points a, made of ^-inch square steel, about9 inches long, are inserted and are held in place by a key,shown at d. The crandall is used to complete the finish ofsandstone after the surface has been partially worked by thetooth ax, or chisel. The patent hammer, shown at (//), is made of from fourto ten thin blades of steel a, which are ground to an edgeand held together by bolts, as shown at /^, so as to form asingle piece. It is used for finishing granite or hard lime-stone, and the number of blades required to give the properf
A treatise on architecture and building construction . uble-headed points a, made of ^-inch square steel, about9 inches long, are inserted and are held in place by a key,shown at d. The crandall is used to complete the finish ofsandstone after the surface has been partially worked by thetooth ax, or chisel. The patent hammer, shown at (//), is made of from fourto ten thin blades of steel a, which are ground to an edgeand held together by bolts, as shown at /^, so as to form asingle piece. It is used for finishing granite or hard lime-stone, and the number of blades required to give the properfineness to the cutting is usually specified as 4, 6, 8, or 10 cut. The hand hammer, shown at (/), is used for drilling holes,and in pointing and chiseling the harder rocks. It is about5 inches in length, and weighs from 2 to 5 pounds. The mallet, shown at (J), is used when the softer stonesare to be cut. It is made of wood, the head being about 7or 8 inches in diameter, and 5 or G inches high. 28. Cliisels. — Fig. 2 represents the different chisels. used in dressing stone. At {(r) is shown the point, which ismade of round or octagonal steel, 8 to 12 inches long,with one end pointed. It is used for chipping off the rough § 8 MASONRY. 15 faces of the stone and reducing- them to approximately planesurfaces, ready for the peen hammer. It is also used to givea rough finish to stone in broach and picked work. At {b)is shown the tooth chisel, used only on soft stones, andserving much the same purpose as the tooth ax. At (r) isshown a d7ove chisel, 2 to 3 inches long at the end, used forcutting or driving the rough surfaces of the stone. At (<•/),{e), {g), and {h) are shown other forms of chisels used fordressing soft stone. At (/) is shown a. pitching chisel, usedfor making pitched-face work, as shown in Fig. 3. 29. Machine Tools.—Besides the hand tools describedin the previous articles, there are a number of machine toolsused to prepare the stone for the finer treatment to
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