36 TRENCHING AND SUBSOILING 



Working. This gin works like that of Grue". Installed 

 on one side of the block, it pulls the plough from the opposite 

 side. The rails on which it travels are kept in place by a 

 few pegs. The non-ploughed headlands have the same 

 dimensions as in the previous case. 



GUYOT'S HORSE-GIN. 



Guyot, implement maker at La Redorte (Aude), has 

 devised a gin of great simplicity, which is easily worked. It 

 obtained at the special show at Perpignan, in 1890, the first 

 prize and a gold medal. It is a travelling gin, without either 

 roller or rails. 



Description. It consists (Fig 16) of a large cast-iron 

 bed-plate, provided with an axle to enable it to be shifted 

 about ; during work the bed-plate rests on the ground. On 

 the centre of the plate a vertical shaft revolves, kept in 

 position at the top by a curb bolted on the plate. On this 

 shaft the winding drum is keyed, which is 19-J inches in 

 diameter, and on the top of the shaft two poles are fixed 

 lift. lOin. in length. The ratio of the speeds are <f$, for, 

 when the cable is wound, the average diameter becomes 

 2 feet. 



The gin, resting on the ground, is fastened by means of an 

 iron bar to a chain ancnored at each end. To displace the 

 gin at each furrow the iron bar is simply slided along the 

 chain, the traction on the cable then suffices to bring the 

 gin opposite the furrow to be opened. The mode of displace- 

 ment of this gin is identical to that of the fixed pulley of 

 the Beauquesne system ; but, whereas the pulley drags out 

 the anchors easily, on account of the large traction exerted 

 on one of them (Fig. 7), the Guyot gin is easily kept in 

 place, for the traction is exactly divided on both anchors, 

 the iron bar being always placed in the prolongation of 

 the bisectrix of the angle formed by the two parts of the 

 anchoring chain. 



The plough is made by Guyot. It is a simple Brabant, 

 composed of a very strong beam, strengthened by a rolled 

 joist girder, to which the different parts are fixed 

 (Fig. 17). 



The depth of ploughing is regulated by means of a 

 screw placed at the rear of the beam. The width and the 

 direction of the furrow are regulated by the position of the 



