11 J [Assembly 



The necessary consequence is, an uneven or disturbed condition 

 of the gavels. (See cut of mower, ante page 105.) 



7. Rugg's Machine — Having cut a portion of grain appropria- 

 ted for the trial, was witlidrawn. 



8. T/ R. Hussey's Machine. — A compact well built machine;^ 

 cuts well except where the grain was thin, in such, places it over- 

 rode the grain w^hich Escaped the knife. The gavels were toler- 

 ably laid. The construction of this reaper avoids all side draft; 

 yet the direct draft, as indicated by the Dynamometer, was greater 

 than any other machine. . . 



9. Densmore's MAcmKS. — This is an ingenious self-raker, the 

 grain being swept from the platform by fingers, with a motion 

 more rapid as it passes the center of it, throwing the gavel from 

 the side. The driver has the power of regulating this action by 

 his foot gathering more or less grain into a gavel, at his option. 



_ This clever machine seems not yet perfected, the stubble is left 

 uneven, and the gavels are not smoothly laid for binding. In 

 this machine may be seen the useful efforts of genius struggling 

 to surmount difficulties, and it seems to present an object where 

 success is within reach. 



Numbers 10, 11 and 12 did not arrive in due season fur triaL 

 The machine of Mr. Obed Hussey , of Ealtimore, reached the depot 

 at Geneva the day after adjournment. 



The established principle in the science of mechanics in regard 

 to cutting tools, that an acute angle is the most effective on sub- 

 stances of woody fiber, seems to hold good in the form of a reaper 

 knife ; this is apparent upon comparing the angles of the several 

 knives, as for instance the height of Mr. McCormick's knife from its 

 base line to the apex is five-eights of an inch, the base line being 

 4| inches ; the power required to cut a swath six feet wide, ad- 

 vancing at the rate of 101 feet per minute, was five pounds y|i 

 for every inch in width of the swath. The height of Mr. Bur- 

 rail's knife above the base is 3^ inches, the base being 3 inches; 

 in this case the power consumed to advance 103 feet in a minute ^ 

 is six pounds f •?^, the swath being five feet wid^. 



