68 



OFFICIAL RKTROSPECXnT. FXHIBITK^X 



McCormick, fiil)ricjin.' ot vendu pendant do nonil)rousos annccs par les 

 prcdccesseurs de la McCormick Harvostinjr Machine Company de 

 Chicag-o. 



No. 42. 



WIIITEXACK'S SELF-RAKING REAPING MACHINE. 



On February 5, 1861, a United States patent was granted to 

 Thomas S. Whitenack for improvement in reapers. In general construc- 

 tion it differed very little from the Dorsey machine. The raking arms 

 were adapted to be operated at will. The vertical shaft was placed in 

 rear of the main supporting wheel, and at its top four radial arms were 

 pivoted. Suitable cams nn(] guiding wheels were secured to upreaching 

 arms on the main frame, and adapted to control the action of the rakes. 

 By the side of the machine, with its end in reach of the driver, was a 

 lever, having at its rear a cam suitably placed to cause the rakes to be 

 elevated after having delivered the grain to the platform. With this 

 switch raised, every arm became a reel, as it rose from the platform after 

 delivering the mass of grain engaged by it. In case it was desired to 

 rake the gavel from the platform, the switch was lowered, which per- 

 mitted the arm to do its work as a rake. The gavel was thus delivered 

 at will, immediately behind the machine. 



No. 42. 



MOISSONNEUSE WHITENACK. 



Le 5 Fevrierl<S61, un brevet des Etats-Unis fut accorde a Thomas 

 S. Whitenack pour perfectionnement de moissonneuses. En con- 

 struction g-encralc cctte machine differait tres-peu de celle de Dorsej. 



