. Automotive industries . given im-petus by the design of war trucks which incorporated thisfeature and demonstrated its utility. Over 57 per cent ofall models listed now have four-speed transmissions. Theremaining models nearly all have three speeds, though thereare a few which have two, five, or more than five gearchanges. Pneumatic tire equipment has become standard ontrucks of one ton and less capacity and is increasing, atleast as optional equipment on many larger sizes. The useof electric starting and lighting has increased slightly, itsuse being much more frequent on the light pneumatic
. Automotive industries . given im-petus by the design of war trucks which incorporated thisfeature and demonstrated its utility. Over 57 per cent ofall models listed now have four-speed transmissions. Theremaining models nearly all have three speeds, though thereare a few which have two, five, or more than five gearchanges. Pneumatic tire equipment has become standard ontrucks of one ton and less capacity and is increasing, atleast as optional equipment on many larger sizes. The useof electric starting and lighting has increased slightly, itsuse being much more frequent on the light pneumatic tiredtrucks, but is not confined to this type. The use of wood wheels still predominates, but the ratioof wood to metal is now less than 2 to 1, whereas last yearit was over 3 to 1, indicating, of course, that the metalwheel is increasing in popularity. Both the number and percentage of models using theworm gear final drive have increased at the expense of theinternal gear and chain types. The bevel gear and double CHAIN. Trend of design with respect to final drive reduction types also show an increase, though the percent-age of models using these types is not large. The number of models of trucks in which the gearset ismounted amidship is almost the same as the number inwhich a unit powerplant is employed. Some regard thelatter type as less accessible than the former, but the useof unit construction cuts down the number of parts re-quired, so that there appears to be little choice betweenthe two types. The practice of making the gearset a unitwith the rear axle has been entirely abandoned. The cone clutch, which six years ago was used on morethan 40 per cent of truck models, is now used by less than6 per cent. The disk and plate types have become increas-ingly popular and are now used on over 94 per cent of themodels listed, by far the majority of these using the multi-ple disk type. A large proportion of the latter run dry,fewer than formerly using the wet plate type. Practi
Size: 2375px × 1053px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
