CONDENSER OP FORCES. 217. 



the ratchett, fo that Q cannot defcend without turning th^ P'^ '• n ^y- 

 pinion qq along with the drum ttrr. ,,.,/^°i''' 



The pinion 9 </ takes in the wheel ah, from the mot i< > s^ 



which the ufeful effect of the machine immediately refuitsj i. 

 that the effect of the defcent of one of the weights Q, is to tr 

 folicit the wheel A B to motion^ or to continue the motion *^'^*^'^» 

 in concurrence with all the other weights Q, which defcend 

 at the fame time. This wheel A B carries beneath it oblique 

 or bevelled teeth G D, which take in a like wheel C E, and 

 caufe the buckets at S to rife. 



The alternation in the motion of thefe buckets may be ef- 

 feded by the mechanifm I have defcribed in the firft volume 

 of the Memoirs of the Inftitute. 



From the preceding defcriplion it is feen that the machine, 

 being fuppofed to ftart from a flate of repofe, the wind will 

 at firft raife a number of weights Q, fufficient to put the ma- 

 chine into motion, and will continue to raife new weights 

 while thofe before raifed are fallen ; fo that the motion once 

 imprelTed will be continued. 



Among the numerous advantages of this new mechanifm we 

 may remark the following : 



1. No violent (hock can take place in any part of the me- 

 chanifm. 



2. The ufeful effed being proportioned to the number of 

 weights Q, which defcend at the fame time, this effect will 

 increafe in proportion as the wind becorpes ftronger, and 

 caufes the fails to turn with more velocity. 



3. The weights Q being moveable along the levers F G, 

 it will always be very eafy to place them in fuch a manner 

 as to obtain that ratio of the effort of the firft mover to the 

 refinance, as fliall produce the maximum of effect. 



4. From this property it refults, that advantage may be 

 taken of the weakeft breezes of wind, and to obtain a certain 

 product in circumftances under which all other windmills are 

 in a flate of abfolute inaftivity : this advantage is of great 

 importance, particularly with regard to agriculture : the wind- 

 mills employed for watering lands are fometimes ina6live for 

 feveral days, and this inconvenience is more particularly felt 

 in times of drought. A machine capable of moving with the 

 (lightefl breeze, rauft therefore offer the moft valuable ad- 

 vantages. 



I Oiall 



