o use horse traction. Waggons like that in Fig. I I are then used, furnished with a central buffer and couplings. The waggons contain 500 litres. A number of them, varying according to the in- clination of the line and the strength of the horse, are coupled together. The Eig. lO.-Earthwork Waggon… … Eig. II. — Earthwork Waggon wilh Central l^uffer. shown at the left of the figure is furnished with a leather cover to the coupling to prevent the horse's tail from being caught in it. For the information of our readers we will calculate the net cost per cubic metre of the extraction of the clay…
