

- 



SPECIAL SUBSOILEKS. 



99 



Behind the plough. We have not been able to find any 

 documents on the practical work of this machine, but it is 

 almost certain that the soil jamming in the axle would 

 prevent the rotation of the screw. This, however, happened 

 with similar machines exhibited since Ransomes', although 

 great care had been taken to protect the bearings against the 

 introduction of any particles of soil. 



Subsoiling machines have been constructed on another 

 principle, the working piece revolving in the vertical plane, 

 the subsoiling teeth being fixed to the tire of a wheel ; such 

 is the principal adopted by Guibal, of Castres (Tarn). We 

 quote Londet's remarks, who witnessed many trials of this 

 machine : * 



" Guibal's subsoiler appeared for the first time at the 

 agricultural show held at Versailles in 1851. Subsequently 

 the inventor added many improvements (Figs. 63 and 64). 

 These figures show the machine as it appeared at the 

 Universal Exhibition at Paris in 1855. 



^> 



Fig. 63. - Guibal's Subsoiler. 



" Guibal's subsoiler (Fig. 63) consists of a cast-iron wheel 

 31 finches in diameter, provided with sixteen pairs of curved 

 teeth, or tines, 12 inches in length. 



* L. A. Londet, professor at the School of Agriculture, Grand- 

 Jouan, Instruments Agricoles> machines et outils (Exhibition of 1855). 



6279. 



II 



