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' An attention to the conftrudlion of fuch ma- 

 chines as that ereded on the top of Newgate, to 

 work the ventilators, might throw fome light on 

 this fubjed. This turned on a pivot, to receive 

 the wind from every quarter, by the impulfe of 

 the (hifting winds impreiTed on the horizontal 

 vane ; and its force was equal to what, would be 

 required to raife a confiderable quantity of water 

 to the height of two or three feet, which is gene- 

 rally fufficient for the purpofcs of draining or 

 floating land. 



It feems to me that a method might eafily be 

 found to check or counceradl the force of the wind 

 when too violent, and even to flop the motiop of 

 the machine, by means of any great increafe of the 

 wind's force. 



I therefore doubt not, but if the exercife of in- 

 genuity were called forth, by the offer of fuitable 

 rewards, it would be exerted fuccefsfully in con- 

 fl:ru6ling fome engine which would efFedually an-» 

 fwer the purpofe. 



I am, &c. 



Marlborough y Bee, S, 1779. 



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