'52 



.Vrchibald's .statement publislied in the Scientific American, 

 Marcli ."), 1870. Since December last, the commencement of 

 Mr. Arcliibald's business in liis new factorv, lie has mannfac- 

 tured for J. C lloadley & Co., the well known ])ortable en- 

 gine manufacturers of Lawrence, eighty sets of wheels, Avith 

 carriages for the conveyance of their engines. Those engines 

 and wheels have been sent not only to different parts of our 

 own country, but to foreign countries. They are also being 

 introihiced to the great wheat fields of the AYest for propelling 

 threshing machines. In reuard to the success of the Avheels, I 

 ([uote from Mr. lloadley 's letter which I have before me : 



"My observation of the practical use of ]\Ir. .Vrchibald's 

 wagon wheels has been rather limited, but sufficient to demon- 

 strate their excellence and to confirm the opinion I had formed 

 of them from theoretical considerations. Those Avhich I ob- 

 served had been exposed for several Aveeks to a temperature 

 of about 2.')()" Fahrenheit at the distance of about fifteen in- 

 ches, and connected to the boiler by an iron axle, so that they 

 received heat both from conduction and radiation. They were 

 also exposed to the heat during a xQvy dry time. The spokes 

 were not loosened from each other by this heat. Their elas- 

 ticity recoiling from the compression they had received from 

 the ^Vrchibald invaluable })res:5 exceeding in amount the shrink- 

 age of the wood in that direction. 



" I have no doubt whatever that wheels made in this man- 

 ner will retain their strength and firmness in any climate. 

 Xothing can be more trving than the test of a threshini!: (>n- 

 gine, and they bore this test perfectly." 



Thus we have Mr, Hoadley's experience, his o])servation, 

 and opinion, which seem to l)e conclusive evidence as to the 

 value of the wheels. IMr. Hoadley's observation spoken of 

 was on the wheat fields of the AVest. 



Every person who has used Avheels to much extent, knows 

 the inconveni^ice and expense attendant in keeping them in 

 [)lace in a dry season like the past, as the spokes shrink, grow 

 loose in the hubs, and consefpiently they must go to the Idack- 



