Without changing the general arrangements, he replaces the pulleys, P
and P', by two half drums, V and V' (Figs. 8, 9, and 10), which are
each cast in a piece with the crosspieces, D² and D³, designed to
replace D and D', and, like them, sliding up and down the columns, A,
of the frame. Motion is transmitted to all the saw blades by a cog
wheel, X, keyed to the vertical shaft, _f_, and gearing with small
pinions, _x_, which are equally distant all around, and which
themselves gear with similar pinions forming the radii of a succession
of circles concentric with the first. All these pinions are mounted
upon axles traversing bronze bearings within the drum, which, to this
effect, is provided with slots. The axles of the pinions are prolonged
in order to receive rollers, _x'_, surrounded with rubber so as to
facilitate, through friction, the motion of all the blades running
between them.

The other drum, V', is arranged in the same way, except that it is not
cast in a piece with the carriage, D³, but is so adjusted to it that
a tension may be exerted upon the blades by means of the screw, _d_,
and its hand wheel.

Through this combination, all the blades are carried along at once in
opposite directions and at the same speed.--_Publication
Industrielle._

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ROBURITE, THE NEW EXPLOSIVE.