opportunities for doing profitable business. Animal motors are too dear.
They are only suitable for driving very small mills in out of the way
localities."

* * * * *




DRIVING GEAR MECHANISM FOR LIFT HAMMERS.


A very interesting system of driving gear for lift hammers was applied
in an apparatus exhibited at Frankfort in 1881 by Mr. Meier of Herzen.
The arrangement of the mechanism is shown in Figs. 1 and 2. In the upper
part of the hammer-frame there is a shaft which is possessed of a
continuous rotary motion, and, with it, there is connected by a friction
coupling a drum that receives the belt from which is suspended the
hammer. In the apparatus exhibited, the mechanism is so arranged that
the hammer must always follow the motion of the controlling lever in the
same direction; but a system may likewise be adopted such that the
hammer shall continue to operate automatically, when and so long as a
lever prepared for such purpose is lowered.

_ab_ is the shaft having a continuous rotary motion, and upon which are
fixed the pulley, c, the fly-wheel, d, and the friction-disk, e.
Upon one of the extremities of the driving shaft is fixed an elongated
sleeve, formed of the drum, g, and of the screw, f, carried by the
nut, h. This latter is supported in the frame in such a way that it
cannot turn, but can move easily in the direction of the axis. Such