... night long the dwellers on Gamble's Hill saw their furnaces shine with a steady glow, and the tall chimneys belch out clouds of dense, luminous smoke into the night. At almost any hour of the day, Mr. Tanner 's well-known black horses could be seen at the door of the War Department, or dashing thence to the foundry, or one of the depots. As consequence of this energy and industry, huge trains of heavy g...