— 19 — 
t il visit to the Marseilles canal it was learned that this 
^. ule had been abandoned for that reason, 
yi \ simpler device for keeping the orifice a certain distance 
' l • v the surface was tried on the Montrose canal, in the 
’ ri 5 tern part of the State. The orifice rose or fell with the 
"r'of the canal, being supported by a float, and was con- 
,•£, M with the lateral by a pipe and a flexible joint. The 
fle in such an apparatus is to make a joint which shall be 
?. f jr-tight and at the same time flexible enough to be moved 
y a moderate-sized float when the water rises or falls. If 
lis can be done it would satisfactorily solve the problem of 
iving a constant flow. 
A modified form of the Marseilles module, without the 
lore objectionable features has recently been invented by an 
aistralian. At a competition under the auspices of the 
linister of Water Supply of Victoria this form received the 
remium of $500* ^ he module consists of a cylinder floating 
ertically, the water passing from the outside to the interior 
f the cvlinder as in the case of the Marseilles module, but 
le rim" of the cylinder is divided into several notches 
istead of one continuous weir. The cylinder is connected 
fith the channel below by a bellows arrangement of leather 
diich will open or close as the water varies in depth. The 
mount of water is varied by varying the .depth to which 
ie weirs are sunk in the water. The inventor is Chas. A. 
)’Ebro of Victoria. The durability of the leather may inter¬ 
ne with the success of this module. 
H. L. Decker of South Fork, Colorado, has arranged a 
oating module based on the principle of the siphon, which 
as some good features and would seem to be adapted to give 
constant discharge. The siphon is arranged to float, so 
hat the difference between the level of the water in the canal, 
nd the mouth of the siphon remains the same. I here is con- 
iderable additional apparatus in connection with it for ac- 
omplishing the object. . . 
The only module of the second class is one which was 
irst placed in operation on the Isabella I. canal of Spain, and 
s due to Senor Ribera. In this one the opening varies in 
ize as the depth of water changes, being larger when the 
vater is low, and smaller as the water is deeper. The method 
tdopted is to allow the water to pass out through a horizon- 
al opening in the bottom of the main canal or the head of a 
ateral. This hole is circular. Through this hole passes a 
dug of metal, which is smaller than the hole, the water pas¬ 
sing between the plug and the outer circumference of the 
ipening. By varying the diameter of the plug at different 
