Illustration: (‡ PLOUGH.)

The plough has been in use from the very earliest ages, and has been

but little altered for many centuries; it is drawn by horses attached

to the chain A at the end of the “beam,” and guided by a man holding

the “stilts” or handles B B, the coulter, C, cuts a perpendicular

slice in the ground, and the “share” or “slade,” D, following, cuts

horizontally, so as to separate a long piece of earth which the

breast or mould-board E, placed obliquely, turns over on one side;

the plough returning at regular distances, successive cuttings are

thus laid side by side, forming narrow ridges; F is an additional

coulter called the “skim-coulter,” for removing the surface of the

earth, and is only occasionally used.

There are a great many kinds of ploughs, each suitable to the kind of

soil to be ploughed, whether light and dry or heavy and moist.

The Boy's Book of Industrial Information · 第 330 / 388 题