. Automotive industries . analysis. The steel has beenspecially prepared by one member of the committee andtested for homogeneity by a magnetic method at the Bu-reau. The drills are to be manufactured from this steelby another member of the committee under carefullycontrolled conditions, after which they will be testedagain magnetically by various members of the commit-tee. Following the magnetic tests, the drills will be re-turned to the manufacturer, who is to give them a thor-ough mechanical test. The committee will then meet andatttempt to correlate the mechanical performance of thedrills
. Automotive industries . analysis. The steel has beenspecially prepared by one member of the committee andtested for homogeneity by a magnetic method at the Bu-reau. The drills are to be manufactured from this steelby another member of the committee under carefullycontrolled conditions, after which they will be testedagain magnetically by various members of the commit-tee. Following the magnetic tests, the drills will be re-turned to the manufacturer, who is to give them a thor-ough mechanical test. The committee will 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 this work is in process of constructionat the Bureau. 260 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE February 10, 1921 Types of Instrument Boards Used on British Chassis (Note extensive use of east aluminum). 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 of the trailer in connectionwith motor driven vehicles. This article discusses this important By Marius C. Krarup UNTIL twenty years ago nearly all loads in trans-portation work, on land, were hauled in vehiclestrailing after the power unit, unless the loadswere very small, the roads very rough and tortuous orprimitive customs prevailed. Elephants, camels, llamas,burros, pack mules and saddle horses, all combined, didnot figure big in tons or miles as against railway trainsand the standard combinations of horses and came the automobile and the motor truck, withtheir high speeds, and temporarily broke up the trailingsystem for transportation on
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