. Automotive industries . st road ti-acks are more orless tortuous while all positive mechanism for guidingthe wheels, including the automobile or Ackerman sys-tem, has so far been only approximately correct, and isliable to be less correct when close tracking is aimed trailer industry, as the illustrationsshow, employs both the Ackerman and thefifth-wheel methods, opinion being dividedwith regard to their comparative may be approximated sufficientlywell by either, depending much on detailsin design and workmanship. The issuebetween the two methods may be decidedby cons
. Automotive industries . st road ti-acks are more orless tortuous while all positive mechanism for guidingthe wheels, including the automobile or Ackerman sys-tem, has so far been only approximately correct, and isliable to be less correct when close tracking is aimed trailer industry, as the illustrationsshow, employs both the Ackerman and thefifth-wheel methods, opinion being dividedwith regard to their comparative may be approximated sufficientlywell by either, depending much on detailsin design and workmanship. The issuebetween the two methods may be decidedby considerations of load space and bodyshape. Side dump bodies, for example, finda large available space with low drop framesand rod-steering than two fifth wheels wouldallow. As to the degree of accuracy in trackingwhich is provided, we are practicallystopping now at the idea that front wheelsof each unit are made to track quiteclosely with rear wheels of the preceding February 10, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 267. supports. These apply particularly to semi-trailers, butalso to two-wheel trailers and dollies. It is reserved forinventive ingenuity to make them more fully automaticwhile losing none of their present dependability. Pole-trailer with long pole adjustable, with alocking device in the trailer frame, to different dis-tances from the motor unit, to which it is coupledby eye and pintle hook. Front end of load rests onbolster swiveled to platform of motor unit, similarto swivel bolster on trailer unit, speaking of four-wheel trailers, but rear wheels areleft free—a sensible compromise favoring simple con-struction and applicable in train formation. Questions relating to the steering system are subjectto debate, of course, and may be more fully elucidatedwith diagrams, but they are overshadowed in practicalimportance by questions of progress in couplings and —__
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
