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Scientific American, Vol. 9, No. 10 (1863) (1863)
leaf 7
r the difficulty. Particularly in It has been remarked in many cases that “ figures For drilling holes in massive castings, in work can’t lie,’’ but experience proves that this maxim, drilling large holes is this trouble manifested ; for which cannot be moved under a drilling machine, or ‘like some… … wrenches we have ever seen ; the principle is certain- OO Patented by S. Ingersoll, May 12, © 1863 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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