automatism of these functions is absolutely complete.

It will be remarked that the piece, H, is provided with an appendage,
H squared, whose interior forms a rack. This rack engages with a pinion, I,
mounted on an axle, J, which carries externally a fly wheel, K. This
axle, J, moves with the various displacements of the lever, and its fly
wheel overcomes by its inertia all backward and forward shocks resulting
from the thrusts due to the sliding of the steel slides in the different
positions of the connecting rods. Such shocks would make themselves
especially felt while the dead centers were being passed.

The velocity with which this pump runs varies from 75 to 80 revolutions
per minute. It easily gives a pressure of 200 atmospheres. With a
hydraulic press having a piston O.27 of a meter in diameter, it
permits of effecting in ten minutes the extraction of the oil from 25
kilogrammes of colza seeds. Referring to the drawings, the scales for
Figures 16, 17, 18 are one-fifteenth actual size, and Figures 19, 20,
21, one-tenth.--_Machines, Outils et Appareils_.

* * * * *




IMPROVED DREDGER.


We illustrate below a dredger of simple construction, well calculated
for doing useful work on shallow streams. The barge is 54 ft. long, 22
ft. beam, and 6 ft. deep. Her draught of water is under 4 ft. Built by