102 M . Girard on Navigable Canals. 
or the other, according as you wish to turn to the one side or 
the other. 
T have not thought it worth while to protract this article, 
already extended to a tedious length, by specifying the ma- 
ny little practical matters, which will occur, in the construc- 
tion of my engine ; such as the mode of supplying the pails 
with oil, of erie the cylinder, so as to exclude it from the 
water of the whee 
t scarcely ane to be added, that I have secured thisin- 
vention by patent. 
References to the figure, Pi, WU. | 
a—piston-rod, 
a 
ccece—water-wheel. 
Giccadiecunt sie of the boat. 
p—cross-piece attached to the piston-rod, 
q—gudgeon of same. 
rrrr—arms of water-whee 
ss—steps for rods saa through ees in sepa 
tt-—rods. 
uuu—steps, 
Ant. ao —Memoir on Navigable Canals, conscdereit se in re- 
lation to i rise and ele tes the distribution. of th their 
Locks : M. P.S. Girarp 
[Translated Eo the French as se pattie is the “ Annales de Chimie” — 
Ju uly, 1820: by J. Doolittle.] 
The expense of water ina navigable canal, acai a giv 
en ses is comp 
= Of a certain vebinbe of water, rabies froma the 
