Gang-Ploughs.-The gang-plough has a framework to which are attached two or more ploughs, together with a seat for the driver. Mechanical means are provided whereby the ploughs may be lifted entirely clear of or be adjusted to any required depth in the ground. the smaller and lighter gang-ploughs may be drawn by horses after the manner of sulky-ploughs ; but in many cases, and especially in England, gang ploughs are employed for steam-ploughing, as previously described.

In Figs. 25 and 26 are given two views of an improved English gang cultivator-plough.

The frame, to which the ploughs are attached, stands on three wheels, of which the middle one is a caster-wheel, while the two end-wheels revolve in turntables, which lift or lower the main frame exactly by the depth of the furrow, according to the direction which is given to the wheel. The plough-skifes turn in sockets, and are connected by a long rod, working short levers, so that the turning round of one plough causes all the others to turn as well. There are, further, two connected horizontal pulling levers, by turning which either backward or forward the ploughs are also turned completely round, and locked. The ploughs themselves are shaped so as to cut with either end. While at work the main frame travels in a slanting position ever the land, the front wheel running in the preceding furrow, the hind-wheel on the unploughed ground, the ploughman steering the furrow-wheel.

In Fig.27 is represented the Collins Gang and Sulky Plough, in which the depth of furrow is regulated by the adjustment of the slide upon the are shown. The ploughs are raised above the ground by throwing the left-hand lever forward, causing the clamp attached thereto to engage the rim of the wheel which carries it over lifting the frame and ploughs. To take the first furrow, the right-hand lever and its rear sliding clamp are drawn back on the arc and fastened at the point necessary to give the required depth of furrow. The left-band lever is then retracted, depressing the ploughs into the ground.