Abstract
THE factors which have limited speed in the past can be grouped under two main heads, which may be roughly described by the words Track and Power. To move rapidly over the ground a smooth track is necessary in order to prevent the vehicle from bumping itself to pieces and from overturning, while power is required to overcome the internal friction of the mechanism and the head resistance which must always oppose motion, until we can arrange to do our travelling entirely outside the earth's atmosphere. These two factors, track and power, have alternately imposed limits on the speed of travel, one coming into operation whenever the other was temporarily removed.
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