130 [Assembly 



In relation to the teeth of cylinders, a difference of | of an 

 inch is observable in the various machines. (See the table.) No 

 speci&l difference in the performance of their work was observa- 

 ble, as derived from the length of the teeth ; the prevailing opin- 

 ion is, therefore, that the shortest are to be preferred, as by their 

 smaller leverage they are less liable to fracture. 



'For many years grain was thrashed by portable machines and 

 left in the chaff, to be cleaned at the convenience of the farmer. 

 The inventive genius of our people next presented to the agricul- 

 turist a combination of parts whereby the grain was thrashed, 

 winnowed, and delivered clean for the granary, at one opera- 

 tion. 



These latter machines are fast increasing in number, and four 

 of this class were presented for trial, while five simple thrashers 

 were exhibited ; all in competition for the same premiums. The 

 class of thrashers with separators and cleaning apparatus, con- 

 sisted of machines presented by Pitts, Scovill, Woodbury, and 

 Hall. The simple thrashers were those of Emery, Westinghouse, 

 Eddy, Badger and Jerome. 



These distinct classes cannot be compared with each other: 

 and your committee have viewed them as unconnected. The 

 great difference in weight and cost of these classes is distinctly 

 noticeable in the table. 



For the purpose of comparing the cheapness of thrashing by 

 these two classes, it may be assumed that 4500 sheaves (or any 

 other number ) is the average quantity of work per day for Pitts' 

 machine ; and that 360 pounds of clean wheat is the yield from 

 each 100 sheaves: these 360x45. crives 270 bushels of clean 



6 ^ 



wheal per day. The machine requires eight horses at 50-100 



per day each, and seven men at one dollar each, making an ag- 



11 



gregate cost of $1 1 per day, or 4 cents and 7 mills per bushel. 



The table shows- that Emery's machine requires twice the time 

 to perform the same work that Pitts' machine will accomplish : 

 therefore Emery will thrash 135 bushels per day. To perform 

 this work Emery requires five men and two horses, the aggregate 

 cost of which is, at rates before stated, $6 per day, or 4 cents 4 

 mills per bushel. 



