74 APPLIANCES FOE 



Bajac (Fig. 37). It seems preferable to fix a pivot on the 

 bed-plate round which the drum and socket-head revolve, Ver- 

 ne tte (Fig. 33). Such was the system adopted by Beauquesne. 

 During work the socket-head is clamped on the drum by a 



Fig. 37. Bajae's Horse-gin. 



coupling clutch, cotters or pawl, each of which may be seen in 

 the above figures. While the plough is being taken back 

 the drum is thrown out of gear, and the horses rested. 



According to the system, the gin is either displaced before 

 each furrow ; in this case it travels on four rollers (Fig. 37), 

 or on a bed-plate sliding on the ground, Guyot (Fig. 16, 

 page 3?) Fondeur, or it is placed in a fixed position during 

 the whole ploughing (Figs. 33 and 35). It is kept in place 

 by means of pegs or surcharge (Pelous). When the work is 

 iinished, the travelling of the gin is facilitated by a special 

 frame mounted on wheels (Fig. 34), very often the bed-plate 

 itself is provided with axles on the arms of which wheels 

 may be fitted (Pelous, Fig. 36). 



The drums are built to wind from 219 to 274 yards of 

 cable, which is made of the best steel wire, varying from 

 0*5 inch to 0*6 inch in -diameter. 



The mechanical yield of simple-effect drums, without cog- 

 wheels, is very high. B. Chabaneix, of the School of 

 Agriculture, Montpellier, made trials in August, 1887, the 

 results of which are given on page 43. 



We may admit in practice that the mechanical yield of 

 simple-effect gins varies between 80 and 85 per cent., 

 -according to the lubrication of the axles which bear 

 -enormous pressures, the length of the poles and the diameter 

 of the drum (rigidity of the cable opposing the winding). 



