Motor Road Transport For Commercial Purposes
(Liquid Fuel, Steam, Electricity)

42 MOTOR ROAD TRANSPORT Advantages of Gompetent Control. A controllable air valve fitted to the carburettor or induction pipe is another means by which the able driver can obtain good and economical effects from the engine. Here, too, the control should be the out- come of fine judgment and prompt but gradual manipulation. In the handling of any machinery, roughness never pays but invariably takes toil. The practical assets resulting from competent control of air, fuel, and ignition are, appreciably reduced consumption of fuel and lubricating oil, smoother and more efficient running, a cooler and cleaner engine, a saving in valve and plug renewals, and a considerably increased length of life of the power unit. It will readily be seen, then, to what an extent the system of driving to be adopted may effect the selection of a van, and also how a particular class of driver will be suitable in the one case, but in the other may not tend to economy in operation.