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He used three sets of wheels, respectively 1-3/4, 2-1/4, and 4 inches wide, and, introducing weights into the carriage to make up for the difference in the weights of the wheels, he found a very sensible diminution in the tractive force required as the width of the wheels was increased, and in a truly scientific spirit, despising the ridicule cast upon him, he persisted in riding about Paris in a carriage with four-inch tyres.

The tractive force is considerable.

For a test load of 120 tons the tractive force is 70 lb per ton, which is sufficient for acceleration, and maintaining speed against wind pressure.

The tractive force was, of course, the Eskimo dogs, and sledges were the means of transportation.

Without the skilful handiwork of the women we should lack the warm fur clothing which is absolutely essential to protect us from the winter cold, while the Eskimo dog is the only tractive force suitable for serious arctic sledge work.