A "humper, " by Rownson, Drew, & Clydesdale, is shown in Figs. 297, 298, and 299, and by it the packages are carried upon a kind of apron or slat conveyor provided with claws every few feet, which successively engage with them and prevent them from running backwards. Another method is to construct the " humpers " with a roller path and two endless chains, one on either side, which are connected by cross transverses which engage with the packages, thus dragging instead of carrying them