s a broad end of the slot at the top, and then (keeping the chuck sta- tionary) to feed the drill down through the slot, thus cutting | the pin drill described above may be employed as a flat bot- | slot through which the shaft passes, and which can turn to the end out quite even. In taking the… … water till just ready for boiling. such as is employed for holes to receive flush rivets or coun- The bluish green bronzes used for ornamental articles are tersunk head bolts, this form of tool being mainly employed then these holes were plugged up by having pieces of round very easily imitated.…
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