then meet andatttempt to correlate the mechanical performance of thedrills with the results of the magnetic tests. The ulti-mate object of this investigation is the development ofapparatus which can be used in a commercial way forthe non-destructive testing of twist drills. The specialapparatus for… … February 10, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 261 Mechanical Requirements for Trailer Progress The use of trailers began long before the development of the motor truck;railway trains utilize the principle. Certain mechanical changes are neces-sary, however, for the progressive development…
Automobiles · Aeronautics
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