Arizona republican., 1918-07-21

tire manufacturers base their guaran- teed mileage on the fixed weight cer- tain size tire is built to carry. Thus tire that is carrying an overload, can not possess the mileage of the tire which is carrying the rated load.
 Overlooking the truck is equivalent to overlooking the motor because the motor is designed to produce power equivalent to the performance of the truck with normal load This shows plainly that if the truck is overloaded. more gear shifting and slower speed, IS well as higher gasoline consump tion must be expected. For example. the truck with rated capacity of five tons has, we will say, motor of a size necessary to take this truck with a five-tOn load of 6 per cent grade without shifting gears. If 2.000 addi tional pounds were added. shifting gears would be necessary to make the same grade, or it might only make a 412 per cent grade without shifting gears. And it is the same way on the level road truck that is built to carry a rated load at say 15 miles an hour would be able to move an over load a probably no greater speed than 10 to F miles an hour.
 W ltH tllc dxl6S-WGdT ana greater resistance, caused by excess weight forces the wheels into the ground When the power is turned on, the diff ,ferential gears are subjected to greater stress to move the excess weight. Thus we can see that when the load is too far in excess, the driving effort on the aXles will also be excessive.
 With the frame built to hold cer- tain tonnage, an overload is bound to cause a deflection each time it is so overloaded. If the elastic limit is over stepped continually, the frame will eventually break.
 It must not be forgotten that the mo- tor truck is built to perform certain service the same as any other com mon carrier. I was recently talking with driver of a motor truck which l knew had been in commission for a considerable number of years. I asked the driver how it was that the truck was in such good condition, and he an swered: Because it has never been overloaded. 1 make it a point at all times to see that it does not carry more than its rated capacity. I have driven trucks that have been over loaded and could not get anything out of them They were always in the re- pair shop and when they were in com mission, l was continually forced to shift gears on grades that they should | have taken with ease. 1 had to be | overcareful in rounding corners for fear that sudden jolt or slight shift ing Of weight would prove the breaking | point to the axles or frame. I was never sure of reaching my destination without having to stop and tighten up l hnl i've Nf or twelve miles an hour on a gallon of gas, as l should have 1 was lucky if I got four or five.
 While I am on the subject, want to state that there is just as much science in loading truck as there is in loading freight car. A good many owners do not appreciate the fact that If truck is not evenly loaded-by that, I mean the weight evenly dis trlbuted-they are subjecting certain 1 parts to the same stress and strain as If the truck was carrying an overload when in reality it might be carrying only half of it's rated capicity
 Tn loading a truck, I always ascer- tain if possible, just what articles are scheduled to go on-the approximate | individual weight, the size and shape and whether they are boxed or loose By knowing this beforehand, in load 1 ing my truck l can arrange the goods so that when entirely loaded, there is minimum amount of waste space be- tween the different cases. This no, only produces an evenly distributed weight but makes the load more com pact and less liable to slide about while in transit.
 IT truck drivers would use judgment in loading and insist on-not overload ing, their truck would not prematurely wear out better tire. gasoline and oil mileage would be secured-more de- pendable service of the trucks would result, which would insure owners meeting shipping and express sched ules more easily and with a great deal more certainty
 Truck over speeding is another habit easy to acquire which results in exces- sive strains and a greatly accelerated rate of depreciation. The advantages of motor truck haulage over horses are not only matter of speed, but rather the gain accruing from constant opera tion in all sorts of weather at anS time of the day or night.
 | Upkeep and depreciation are serious items to the truck owner and the rela- tion between efficiency and speed is ot equally vital importance That's why the over-speeding of heavily loaded trucks in rough and tumble fashion i. every bit as dangerous as truck over loading.