310 M. P. S. Girard on Navigable Canals. 
a distance of 6 Kilometres (32 miles) which occasions a 
considerable annual expense. 
According to the most accurate information, the weight 
of matter annually transported from Creuzot to the creek 
is about four millions of Kilogrammes, or 4000 tons; 
while the weight of articles which ascend, and which con- 
sist principally in soda to supply to glass-works, and in 
castings from Pranchic Comté, does not exceed 400 tons. 
The weight of matter which descends from Creuzot into the 
canal, is therefore, to the weight of matter which is carried 
up to the establishment; as 10 is to 1. 
“A navigable canal which should be established from 
Creuzo’ uld there- 
proper proportions were observed between the lift of the 
— and the draft of the boats destined to navigate the 
canal. 
lf, for example, the boats employed in this navigation 
drew, when loaded, 1,%9; metres, (43 feet,) these boats 
when returning would draw but 20 centimetres, (62 inch- 
es); the difference of draft in the same boats when de- 
scending with a full charge or returning with one tenth 
part of a full load, would therefore be 11°, metres. (3 feet 
74 inches, nearly.) 
ne d nce of level above and below the lock. 
_‘Wfit be objected that the multiplicity of locks would re- 
tard the navigation, without considering that it is here 188 
& question economizing time than water, it is mot difficalt 
assure ourselves that this objection is without founda 
