Even in 1884, when 100 ounces of aluminum was placed as the capstone on the tip of the Washington Monument, aluminum’s price was $1 per ounce, the same as silver—at a time when a dollar bought nearly 500 pounds of coal, 150 bricks, 15 pounds of flour, or a day’s work. Within two years, a cheap processing method was devised and laid the groundwork for the modern aluminum industry.
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