M. P. S. Girard on Navigable Canals. 31h 
We have already seen that the exportations from Creu- 
zot, in pit coals and castings, amounted to 4000 tons per 
anaum ; let us now suppose that their transportation should 
be effected in 200 days, this would be a movement of 20 
tons per day ; Jet us suppose farther that boats of that ca- 
pacity are employed, that is, of 20 tons hurthen, these boats 
will be about 14 metres (46 feet) long, 1°, metres (4 feet 
11 inch.) wide, fain wi i draw 1;°,°5 sacives (4; feet) of wa- 
ter, including their weight. 
The fall of each lock b being fixed at one metre it would be 
necessary to draw from some other level 20 to 22 tons of 
water to fill the basin of its descending lock. This water, 
being introduced by orifices whose sum should be equal to 
; of a square metre, (194 inches square,) we find, after ma- 
king all necessary corrections, that to empty and fill the ba- 
sin, it would not require, quite a ig aap two other 
minutes for lost time, we see that the passage of the boat 
through 48 locks would require pi two hours and an 
half, allowing three hours for going the remaining length of 
the canal, and the whole duration of the passage from the 
lower pond of Creuzot to the creek of Torcy would be but 
five hours and an half; which would permit a boat to de- 
scend and return in the shortest days of the year. 
is example suffices to shew how easy it would be by 
establishing navigable canals, such as the one we have just 
described, to increase the operations -of extensive iron 
parts of their machinery are generally moved by water, 
and the water wpe from the coal mines would be sufficient 
to supply such a 
If, instead of “a placed at the bottom of a gorge with- 
ont issue, as are the establishments of Creuzot, the coal 
mines, the Iron Founderies, the Marble quarries, the for- 
ests, &c. to be worked, were situated on a culminating 
point between two vallies traversed by navigable —_ the 
canal which should unite these two rivers might be 
structed according to our principles 
ee arama ge articles par ay in thig:chse, front the 
point of the canal must necessarily descend to 
Bene at the point of consumption, and will never be re- 
Beredic at the place whence they are taken, by articles of 
equal weight ; it is evident that, in virtue of the excess of 
