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Scientific American, Vol. 3, No. 18 (1860) (1860)

leaf 3

An illustration from Scientific American, Vol. 3, No. 18 (1860), 1860, leaf 3
e purpose of utility to which the shape or configu- screen upon which it is shining either light or dark, al- may not succeed.in these latter days of wonders; and ration of this design has reference, is to economise time though I have nothing in the course of this ray of light yet, having paid some… … pipeg, or in such other objects as they may be required, Messzs. Eprrors:—As you appear to be very good- for which purposes ratchet drilling braces are at present natured in the way of answering questions, I take the generally used, but are objectionable from the time con- sumed in drilling. , this…

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