increased leverage is effected without increased friction, which is the
result of "putting on the power" in some of the two-speed contrivances.

Having spoken of the Oarsman tricycle, I must express regret that I have
not been able to find an opportunity to ride on or with the machine, so
that I cannot from observation form an opinion of its going qualities.
There can be no doubt that the enormous amount of work that can be got
from the body in each stroke on a sliding seat in a boat must, applied
in the same manner on the Oarsman tricycle, make it shoot away in a
surprising manner; whether such motion, when continued for hours, is
more tiring than the ordinary leg motion only, I cannot say for certain,
but I should imagine that it would be. The method by which the steering
is effected by the feet, and can with one foot be locked to a rigidly
straight course, is especially to be admired.

There is much difference of opinion with respect to the most suitable
size for the wheels of machines. Except with certain machines, this has
nothing to do with the speed at which the machine will travel at a given
rate of pedaling, for the wheels may be geared up or down to any extent,
that is made to turn more quickly or slowly than the cranks. Thus the
most suitable speeding is a separate question, and must be treated by
itself.

Large wheels are far superior to small wheels in allowing comfortable,
easy motion, a matter of considerable importance in a long journey. They
are also far better than small for running over loose or muddy ground,
for with a given weight upon them they sink in less, from the longer
bearing they present, and this, combined with their less curvature,
makes the everlasting ascent which the mud presents to them far less
than with a smaller wheel. On the other hand, the large wheel is