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Perplex and difficult of solution are many of the new administrative problems which appear in the marketing of commercial cars. This is particularly true on account of the transition taking place in the industry, from the manufacture of pleasure cars to the production and application of the commercial type to economic service, and administrations are suddenly confronted with realization of the necessity for entirely different methods of operation, if not a completely different fabric of organization. The characteristics of the commercial line are in radical contrast with the pleasure car business, the inception and purpose of the one being so different from the other as to render obsolete many of the formulated practices heretofore in vogue, conspicuous among which is a too complete reliance upon the individualistic function performed by the salesman.

The question of the selection of the proper sizes of ball-bearings for any given set of conditions is one that should properly receive the consideration of those most expert in their design and application. However, in change speed gear design, where the ratio between the diameters of the bearings and the diameters of the gears is small, the sizes of the bearings have so great an influence on the center distance of the shafts and the shape and outline of the casing that a change in the bearings from those originally laid out frequently necessitates the redesigning of the whole job.