abuts against the two-armed lever, z, and this latter then disengages
the rod, y, so that the weight, G, can move the fork, B, in such a way
that the belt shall pass from the fast to the loose pulley.

Motion is communicated to the machine as a whole by the shaft, C, which
is provided with a fast and loose pulley. As shown in the engraving, the
pulley, D, moves the tool, and the pulley, E, causes the revolution of
the shaft, n, through a helicoidal gearing, F.

The construction of the tool carrier is represented in detail in Fig. 3.
The cutting tool, F, rests on a sleeve forming part of the pulley,
r1, against which it is pressed by a nut, while its position is
fixed by a key. The axle, s1, of the tool is held in two boxes, in
which it is fixed by screws. In order that the tool may be placed
exactly in the axis of the wheel to be toothed, and that also the play
produced by lateral wear of the pulley, r1, may be compensated for,
two screws, r2, are arranged on the sides. All rotation of the
shaft, s1, is prevented by a screw, o, which traverses the cast
iron stirrup, C, and the steel axle box.

* * * * *




RECENT HYDRAULIC EXPERIMENTS.


At a late meeting of the Institution of Civil Engineers, the paper read
was on "Recent Hydraulic Experiments," by Major Allan Cunningham, R.E.