National Geographic : 1917 Aug
LOADING ORE INTO CARS AT ASHTABULA, OHIO The most massive ore-handling machinery in the world is in use at this great lower lake port. Here come untold millions of tons of ore to be transhipped to Pittsburgh, Youngs town, and other blast furnace points. The big Hulett unloader dumps its burden into a bin almost as soon as it is out of the hatchway. While it is diving down into the hold for another load, the bin, which is mounted on wheels, moves away and dumps its contents into waiting cars, as seen in the picture. By the time another mouthful is ready the bin is back to receive it. The cars are standing under the rear end of the unloader, as that big mech anism is seen in the picture on page 134. 16 pounds to the square inch. A veri table inferno results, and the blast causes all the oxygen in the air to unite with the carbon and leave through the gas pipes. The ore and the limestone melt under the ordeal and the foreign matter in the ore unites at once with the molten lime stone. Being lighter than liquid iron, these newly wedded soul-mates rise to the top of the bubbling cauldron as oil rises to the top of water or cream to the top of milk. There are two holes in the lower part of the furnace. Out of the upper one of these, when tapped, come the affinities, now liquid slag, which soon hardens and is shipped away to be made into prosaic cement.