Along one side of the room ran a narrow gallery, a few feet from the floor; into which gallery the cattle were driven by men with goads which gave them electric shocks. Once crowded in here, the creatures were prisoned, each in a separate pen, by gates that shut, leaving them no room to turn around; and while they stood bellowing and plunging, over the top of the pen there leaned one of the "knockers," armed with a sledge hammer, and watching for a chance to deal a blow. The room echoed with the thuds in quick succession, and the stamping and kicking of the steers.The instant the animal had fallen, the "knocker" passed on to another; while a second man raised a lever, and the side of the pen was raised, and the animal, still kicking and struggling, slid out to the "killing bed."Here a man put shackles about one leg, and pressed another lever, and the body was jerked up into the air.There were fifteen or twenty such pens, and it was a matter of only a couple of minutes to knock fifteen or twenty cattle and roll them out. Then once more the gates were opened, and another lot rushed in; and so out of each pen there rolled a steady stream of carcasses, which the men upon the killing beds had to get out of the way.