loses its support in front, and is therefore not serviceable. When
necessary, the combined motor can draw a second ordinary carriage.

The motor by itself occupies a length of 9 ft. 8 in. It has two
horizontal cylinders; the four wheels of the bogie are coupled, and
between the wheels the sides of the framing are rounded to allow two
vertical boilers to stand. These boilers have vertical tubes for the
water, which are joined together at the top by a horizontal cylinder.
Each boiler, with its covering, is 1 ft. 9 in. in diameter. The boilers
stand 1 ft. 9 in. apart, thus affording space between them for the motive
machinery, including the pump. The crank axle is behind the boilers. The
levers, the injector, the access to the fire-box, a pedal for working the
engine brake as well as a screw brake for the carriage, are all in front.
The brakes act on all six wheels, are worked by the driver, and the whole
weight of the engine, car, and passengers being carried on these wheels,
the car can be stopped almost instantaneously; and as over two-thirds of
the entire weight of the car and passengers rests on the four driving
wheels; there is always sufficient adhesion on all reasonable inclines,
and the adhesion is augmented as the number of passengers carried
increases. Hence this car is adapted for lines with heavy grades.

A small water tank is attached to the framing; two small boxes for coal
or coke, with a cubic capacity of about 31/2 feet, are attached to the
plate in front of the bogie. The covering of the boilers is in two parts,
which are put on from each side horizontally, and screwed together in the
center. The removal of the upper part enables the tubes to be examined
and cleaned. The draught is natural; the base of the chimney is 3 ft. 2
in, from the grate; the height of the chimney is 5 ft. 2 in.

The steam from the cylinders passes directly into a condenser placed on
the top of the carriage. The condenser is made of corrigated copper
sheets millimeter thick. Two sheets, about 15 to 18 inches wide and 15
feet long, are laid together and firmly soldered, forming a chamber.
Twenty of these chambers are placed side by side on the top of the
carriage, connected with a tube at each end, so as to allow the steam to
pass freely through them. The lower corrugations in the several chambers
are connected together, and thence a pipe with a siphon to stop the steam
is carried to a water tank under the carriage, which thus rece