The most silent, neatest, and cleanest driver, the one of which the
working friction is least, is the endless steel band, so well known in
connection with the Otto bicycle. This is not, as far as I am aware,
employed on any tricycle, makers probably fearing lest it should slip.
The Otto shows that it can safely be employed.

I have devised a scheme, of which I now show a model, which seems to me
to be free from the objections which may be urged against other methods;
but I, of course, cannot be considered in this respect a judge.
Eccentrics are well known as equivalent to cranks, but if used in the
same way, with a connecting rod, either fatal friction or enormous
ball-bearings would be necessary. Instead of these, I connect two pair
of equal eccentrics by an endless band embracing each, so that the band
acts like a connecting rod without friction, and, at the same time,
acts by its turning power as on the Otto, thus making two eccentrics
sufficient instead of three, and carrying them over the dead points.

There is one more system of transmitting power employed on a few
machines. In these, a band or line passes over the circumference of a
sector or wheel, and the power is directly applied to it. The motion of
the feet in the omnicycle, and of the hands and body in the Oarsman, is
therefore uniform. There would be no harm in this if it were not for the
starting and the stopping, which cannot be gradual and at the same time
effective in machines of this type. For this reason, a high speed cannot
be obtained; nevertheless, these machines are better able to climb hills
than are tricycles with the usual rotary motion, for, at all parts of
the stroke--which may be of any length that the rider chooses--his
driving power on the wheels is equal. The ingenious expanding drums on
the omnicycle make this machine exceptionally good in this respect, for