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confident it will appeare that most Wind-Mills stand 

 still above half the year^ though not altogether at one 

 time. And for this cause no man will grind at a 

 Windmill, that can as conveniently grind at a Water- 

 Mill ; And he may have grist when the wind serves not^. 

 or want when the wind serves. 



Fifthly, The Cog-wheels in most Wind-Mills are (in 

 the diameter) 8. foot or under (I take the example 

 from one of the best Wind-Mills in the Moore-fields, 

 which I think is not much inferiour to any in England) 

 the trundle is at the least two foot, which is 4. to 

 one. Now I have observed in a pretty stiffe gale, that 

 the sailes, and consequently the Cog-wheele hath gone 

 about eight times in a minute, that is 24. tumes 

 in a minute for the stones : And for the most part 

 of the time they work, it is not above this rate, 

 which cannot dispatch above 3. bushels in one houre, 

 but a good Mill of mine may grind a quarter. 



The 5th. principle of Motion is water, or the Water- 

 Mills : These also are lyable to some inconveniences. 



First, if the foundation be not carefully and skilfully 

 laid, all is in danger to be eradicated. 



Secondly, if the banks of the dam break, the water 

 runs the wrong way. 



Thirdly, in great floods she stirs not. 



Fourthly, in droughts in Summer most Water-Mills 

 want water. 



Fifthly, not one of a hundred hath water at any 



