The Dexter bicycle only differs from other two-wheeled machines in one
respect. This, however, is quite important. By a simple and effective
device, it admits of an instantaneous connection and disconnection
of the crank with the axle of the driving wheel, keeping the treadles
stationary or in motion, at the will of the rider, while the wheel
continues to revolve. Ordinarily, in obtaining a high rate of speed
on a velocipede, the rapidity of the revolution of the crank becomes
too great to be followed by the movement of the feet, except at the
expenditure of too much exertion. This difficulty is wholly obviated by
Mr. Dexter. A continuous and uniform rate of speed may be kept up with
his machine without fatiguing the rider.