similar circumstances. In descending a hill, there is a break fixed on
the hind wheel to increase the friction; but independent of this, the
guide has the power of lessening the force of the steam to any extent,
by means of the lever to his right hand, which operates upon, what is
called the _throttle valve_, and by which he may stop the action
of the steam altogether, and effect a counter vacuum in the cylinders.
By this means also he regulates the rate of progress on the road, going
at a pace of two miles or ten miles per hour, or even quicker if
necessary. There is another lever also by which he can stop the vehicle
_instanter_, and, in fact, in a moment reverse the motion of the
wheels, so as to prevent accident, as is the practice with the paddles
of steam-vessels. The guide, who sits in front, keeps the vehicle in its
proper course, by means of the pilot-wheels acting upon the pole, like
the handle of a garden-chair.

The weight of the carriage and its apparatus is estimated at 1-1/2 tons,
and its wear and tear of the road, as compared with a carriage drawn by
four horses, is as one to six. When the carriage is in progress the
machinery is not heard, nor is there so much vibration as in an ordinary
vehicle, from the superior solidity of the structure. The engine has a
twelve-horse power, but may be increased to sixteen; while the actual
power in use, except in ascending a hill, is but eight-horse.

The success of the present improved invention is stated to be decided;
but the public will shortly have an opportunity of judging for
themselves, as several experimental journeys are projected. If it should
attain its anticipated perfection, the contrivance will indeed be a
proud triumph of human ingenuity, which, aided by its economy, will
doubtless recommend it to universal patronage. Mr. Gurney has already
secured a patent for his invention; and he has our best wishes for his