. Automotive industries . the roughness of service, the length ofthe coupling wanted, the preference for draft from frameto frame or from frame to axle. The equivalence referred to does not merely permitsimplification of diagrams. It also makes it clear thatall tracking can be plotted as free trailing after a lead-ing point—the hook or joint—so located in fixed relationto the leading vehicle (or pair of wheels, in the case offour-wheel steering) that it is moved to the outside ofthe curve to be described, the side opposite to that ofthe turn. By the use of automobile steering linkage theactual
. Automotive industries . the roughness of service, the length ofthe coupling wanted, the preference for draft from frameto frame or from frame to axle. The equivalence referred to does not merely permitsimplification of diagrams. It also makes it clear thatall tracking can be plotted as free trailing after a lead-ing point—the hook or joint—so located in fixed relationto the leading vehicle (or pair of wheels, in the case offour-wheel steering) that it is moved to the outside ofthe curve to be described, the side opposite to that ofthe turn. By the use of automobile steering linkage theactual displacement of the leading point can be mod-erated, as when small overhang of the hook or joint isstructurally desirable, and the desired tracking effectnevertheless obtained, but the plotting of the track canbe done with a simplified diagram showing the equiva-lent theoretical displacement. The requirements foreasy and rapid plotting of vehicle movements are thusreduced to: Simple diagrams of vehicles and a simple. There Is shown a crossing of city street 60 feetwide and one of country roads 30 feet wide, andit is indicated why the steering requirementsmust normally be almost the same for both condi-tions. A wide turn and a close turn are traced Inboth cases. On the country road (or narrow citystreet) a trailer outfit must return to Its side ofthe road after a wide turn, while on a wide streetit does not leave Its own side. The sharp turnsare Identical, except for the easement from roundedcity corners method for constructing any free-trailing curve. Thelatter is shown in Fig. 14. A comparison of city and country conditions, to bothof which most trucks and trailers must conform, is illus-trated in Fig. 11, with a view to establishing a workingidea with regard to the shortness of turn that is requiredfor operating comfortably in normal or sharper turns may be preferable at times, butfor comparison of different systems for securing what-ever degree of tr
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