92 



DRAINING OF THE POND OF CITIS. 



a pressure capable of raising the whole of the water in the 

 cylinder, which is of the weight of 466"0 lbs. avoii-dupois. 

 Raises 60611 The engine is calculated to raise 69^11 cubic feet of water 

 cubic feet, or twentv-four hours, making a weight of 38845 cwt. or 



1942 tuns oi ^ •' , . , . . , 



water in a day. 19-t2| tuns. It is obvious, that if it were required to raise a 

 Adequate greater quantity of water, and at the same time to a greater 

 jneans would jjpjphl as of 500 feet for instance, the same steps should be 



produce a H» i n^iv ri t 



greater effect, adopted, increasing proportionally the diameter of the cylin- 

 der of the steam engine, the dimensions of which give the mea- 

 sure of the power, and increasing the thickness of the cast 

 iron pipe, so-that it might be able to resist the pressure of the 

 water forced into it. 

 Novelties of Before the draining of the pond of Citis, we do not believe a 

 the morie. steam engine has been employed for such a purpose ; still less 

 pumps moved by the usual agents ; or that any attempt has 

 been made to raise a large quantity of water to a considerable 

 height in a constant and uninterrupted stream. For this new 

 application of it therefore we are indebted to Mr. de Jesse, 

 and we trust that many enterprising persons will avail them- 

 Placcs where selves of it. In the south of France, and near the coasts of 

 "iTd^w' h^ d^' ^^^^ Mediterranean, there are a great many ponds, which it 

 vantage. would be of importance to drain; their vicinity being a 



scourge to a country in other respects so much favoured by 

 nature. Some attempts that have been made in the depart- 

 ments of the Aude and Gard enable us to presume, that the 

 mature of the soil is in general excellent. 



We conceive, that no draining can be attended with more 

 difficulties than that of the pond of Citis j that Mr. de Jesse's 

 ftiethod is applicable to any pond to be drained, attention be- 

 ing paid to local circumstances ; and that is equally applica- 

 ble to great morasses, the whole produce of which it would 

 be so advantageous to obtain, at a time when the scarcity of 

 iire-wood cieates anxiety for the meansof supplying the want 

 of fuel. 



• Ixplanation of P/. Ill, and PL IV, Jg. 1. 



Explanation of A. The pond of Citis. 



the i laleb. ^^ ^.j^^ .^^.^^^ ^, ^[^^ ^^^^ ^^^jj^.j ^^^ ^^.^^ ^f -Q^^y^^ 



a. Level of the pond of Citis. 



b. Level 



