VAKIors IXVKXTIONS. 1!> 



zontally, on the barn floor, so as to tighten the rope. I shall 

 put down the top of the boiler level with the surface, with an 

 arched way to the fire and ash-pit under ground, to prevent the 

 chance of fire, which the farmers are very much afraid of. I 

 send you a sketch showing how it is to stand. 



" I do not bind you to the size of the drum or wheels, only 

 the room that the fly-wheel works in is but 7 feet wide. 



" Now to Mr. Richards' mill. 



" Query 1st. The length of the piston, and the small variation 

 that the beam will give it, is so trifling that it will not be felt. 



"The cylinders that have been working on their sides for 

 seven years past, are now working as well as any engine with 

 upright cylinders, which is a proof that the little nibbing is of 

 no consequence. 



" Query 2nd. The passage in the cock is equal to the passage 

 we make in our large engines, which is only one-fortieth part of 

 the piston ; and as we shall work with high steam, we do not 

 mind the pressing through the steam-passage ; and as the steam 

 will be very much expanded, it will not be felt in the passage 

 to the condenser. I know where we have removed cylinders 

 and put larger ones on the same nozzles and condensing work, 

 and the engines did good duty. 



" Query 3rd. I find by experience that if you give double 

 the quantity of injection to an engine one stroke, and none the 

 other, that the quicksilver in the gauge will stand nearly 

 tlic same ; the cold sides of the condenser are sufficient to work 

 an engine a great many strokes without any injection. 



" Query 4th. You may put a hanging to the air-pump 

 bucket, and foot-valve ; either that or a rising one w 7 ill do very 

 well, but I think the rising cover and wood face on the top, 

 bbst. 



" Query 5th. The air-pump bucket is large enough. At 

 Wheal Al fred they have a 64-inch cylinder ; the air-pump is 

 20 inches, and the stroke is half that of the engine. They were 

 afraid that it was too small ; they then put another of 14 inches 

 by the side of the first, the same stroke. The quicksilver tube 

 stands as high with the one 20-inch bucket as with the two 

 buckets; the engine works host with the on? bucket. 1 have 



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