 | Peter Nicholson - 1845 - 430 страница
...surface, and the cutting edge must stand obliquely to the axis of the cylinder, so as to prevent either angle from running into the work ; the chisel ought...of various sizes, from a quarter of an inch to two incites and a half: these are convenient in running mouldings and cleaning the bottoms of grooves.... | |
 | Charles Colcock Jones - 1873 - 622 страница
...few of which still bear the trace of the natural canal. Those of the elongated shape vary in length from a quarter of an inch to two inches and a half, and in diameter from one-sixth of an inch to one inch. The disk-shaped beads vary in thickness from... | |
 | Charles C. Jones - 1873 - 622 страница
...few of which still bear the trace of the natural canal. Those of the elongated shape vary in length from a quarter of an inch to two inches and a half, and in diameter from one-sixth of an inch to one inch. The disk-shaped beads vary in thickness from... | |
 | Brighton and Hove Natural History and Philosophical Society, Brighton - 1874 - 800 страница
...has been the hardest, and the Kimmeridge clay the softest yet found ; and the penetration has varied from a quarter of an inch to two inches and a half per minute. Numerous difficulties have had to be contended against, not the least of which has been... | |
 | 1890 - 1208 страница
...been found in many places; but their origin was first pointed out by Dr. Hentzen in 1805. They are from a quarter of an inch to two inches and a half in diameter, their internal surface of a perfectly glassy substance, hard enough to scratch glass,... | |
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Chisels are of various sizes, from a quarter of an inch to two inches and a half: these are convenient in running mouldings and cleaning the bottoms of grooves. 