56 TRENCHING AND SUBSOILING 



It should be noticed that this device only works well 

 while the cable is new, and retains the diameter for which 

 the winding guide was made. If the wear or the natural 

 lengthening of the cable diminishes its diameter, the winding* 

 is more defective than if there were no guide. 



Finally, the automatic displacement of the system, which 

 is very ingenious indeed, does not seem to be very useful. 

 Its mechanism is complicated, and its management requires 

 a prudent and skilful man to prevent the system becoming- 

 derailed. And what is more, the two rollers being fixed on 

 the same shaft, renders it impossible for the machine to 

 travel obliquely.* 



The machine could therefore be simplified with advantage. 

 Transformed into a simple effect drum, the complicated 

 mechanism being removed, but the details of construction 

 being preserved, this machine would be more favoured by 

 growers than the double effect machine exhibited at the 

 Perpignan Show in 1890. 





 PECARD BROS/ STEAM WINDING DRUM. 



Messrs. Pe*card Bros., of Severs, construct a machine 

 having a certain analogy to that of Guyot. Engine and 

 drum are carried on a strong frame. There is a large drum 

 for the traction cable, and a small one for taking the plough 

 back to the starting point, the only differences being that 

 different speeds can be obtained and that the lateral dis- 

 placement of the system is automatic, as in the case of 

 Pelous' winding drum. 



Description. The portable engine, 7 to 8 H.P. generally, 

 is carried by a strong frame on which the capstan is bolted 

 (Fig. 28). The system is carried by six rollers running on 

 rails. The fly-wheel of the engine is connected by a cross- 

 belt to the pulley of the drum, which has a double cog- 

 wheel gearing. Two levers enable the combination of the 

 cog-wheels to be modified and four different speeds obtained. 

 One of these levers also serves to disconnect the large drum. 

 A small drum running at two speeds is keyed on the inter- 

 mediate shaft. 



The automatic displacement of the system is effected by 

 another cross-belt passing over the small fly-wheel of the 

 engine. A double cog-wheel gearing with an endless screw 



*This is comparatively unimportant in Victoria, as the blocks are 

 generally rectangular. (Trans.) 



