The essential improvement which rendered it possible for this conveyor to be made in such proportions was the introduction of the balancing device, by means of which the conveyor is made in two halves, one being about 2 in. higher than the other, so that one half delivers into the other half. The two sections are Fig. 155. Cross Section of Balanced Zimmer manipulated by triple and multiple cranks Conveyor. which stand at an angle of about 180° to each other. One half of the conveyor moves forward whilst the other moves backward, and at the same time the material is moved from end to end and in the same direction, as all the spring legs are of the same inclination. A portion of such a balanced conveyor is shown in Figs. 154 and 155.