t blow up a heating boiler at the first trial; buton the other hand, algebraic formulas cannot teachthe light hand and quick eye of a good mechanic : sothat such examinations should be arranged to testboth the theoretical knowledge and the practical in-telligence of the candidate, and great skill… … KELLERS RAILWAY CAR JACK. car axles, or for raising the box without disturbingthe position of the wheel on the track, is shown here-with, and has been patented by Daniel A. Keller, ofRincon, New Mexico. The jack is shown in perspec-tive in full lines in the illustration, its position on thecar…
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