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Scientific American, Vol. 56, No. 19 (May 1887) (1887)

leaf 6

An illustration from Scientific American, Vol. 56, No. 19 (May 1887), 1887, leaf 6
a rubber band or other fasten- spindle, and will hold a % round drill, or the ordinary ing it must be secured with its back firmly against a flat surface from which it rebounds, and the angles square tapered shank or brace drill. The balance the flat surface of the pin. It should correspond are… … wire or delicate plumb line is held in front of it near posed that 300,000 more shall bet taken in hand by STEABNS' NEW BENCH DBILL. means of 120 miles of canals and dikes. It is further the line of the circle, and is shifted until it covers its reflection in the mirror. The position it occupies is…

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