National Geographic : 1917 Mar
Two chains, one on each rear wheel, are absolutely necessary- One is rather a detriment and in most cases is even inclined to accentuate the skid and throw the car out of balance. Is it any wonder the differential looks pained and worried when inexperienced motor ists insist upon working it overtime ? Do you know the purpose of the differential and how it operates ? Without it no motor car would be able to turn a corner evenly and smoothly. Power is supposed to be transmitted evenly to both driving wheels. When either of these wheels meet with resistance, the ever watchful differential transmits that power to the other where there is less resistance. Now, what is the result when a chain is used on only one wheel? A certain amount of resistance or gripping. So the power naturally goes to the other wheel and as this has no gripping surface it spins. The specific purpose of the chain is thwarted, worse still, it has a natural tendency to accentu ate the skid. Furthermore, can't you see this spinning will unnecessarily wear the tire and throw your whole car out of alignment? Suppose one of your brake rods smashed and only one remained effective. What would happen when you applied the one brake ? Your car would swerve, of course. An added uneven strain would be thrown upon the whole mechanism, doing probably irreparable damage. The conditions are similar. The necessity for brakes for both wheels and chains for both wheels is obvious and clearly defined. If one chain would do the work, why use more? But motorists and mechanics who are well posted gaze with pity at the man who foolishly drives with only one chain when two are abso lutely necessary on the rear wheels and two on the front wheels are an added precaution. Weed Chainsfor allStyles and Sizes of Tires are sold by DealersEverywhere. "Mention the Geographic-It identifies you."