TRENCHING AND SUBSOILING. 151 



power and the rate may increase or diminish, or even stop, 

 without inconvenience. Such are tanning, oil, flour, and 

 sawing mills, and, above all, irrigation, draining, and trench- 

 ing this we intend to study. 



DIFFERENT SYSTEMS OF WIND MOTORS. 



Windmills, the origin of which is very remote according 

 to historians, who trace them back to Oriental nations, were 

 much more used for all kinds of operations formerly than 

 nowadays. The facility of transit and competition with 

 steam-power have reduced their use to instances where they 

 are really economical. Finally, their immovable nature and 

 great size, when a certain power has to be obtained, prevent 

 their use for farm works other than those for which they 

 are specially erected. It is to be assumed that the portability 

 of Lucet's motor will satisfy many requirements. 



Wind motors may be divided into three classes : 



1. Motors with horizontal or slightly inclined axis: 



Ordinary windmills, with slightly concave blades ; 

 Dutch windmills, with plane blades ; 

 Berthon, Durand, Bellon windmills ; 

 American windmills, with plane blades ; 

 Lucet's motor, with parabolic blades. 



2. Motors with vertical axis : 



Robinson's Windmill ; 

 Panemones, &c. 



3. Atmospheric turbines. 



The description of the principal types of wind motors may 

 be found in almost all works on industrial or agricultural 

 engineering ; it is therefore easy to choose amongst them that 

 which will apply best to the class of work required. There- 

 fore, we will only study Lucet's motor, which is actually in 

 use at the inventor's property at Conques, near Carcassonne. 

 Its novel arrangements and restricted dimensions for so 

 strong a motive power deserve special attention. 



LUCET'S MOTOR. 



The motor requires no foundation or anchoring, for it is 

 portable. It could even be called a locomotive if its rate of 

 travelling allowed such a comparison to be made. It is 

 astonishing to see this machine, heavy enough to resist the 

 traction of the plough, hauling itself on its cable simply by 

 the action of the wind, travelling slowly but surely over 

 ploughed land, roads, or bridges. 



