The following is an outline of the process when hydrochloric acid is used: Starch ("` green" starch in America) is made into a "milk" with water, and the milk pumped into boiling dilute acid contained in a closed "converter," generally made of copper or cast iron; steam is led in at the same time, and the pressure is kept up to about 25 lb to the sq. [Please select]
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A converter holds from 5 to 25 tons of metal and requires about 20 minutes to finish a charge. [Please select]
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Though he was profoundly impressed by his first sight of a Bessemer converter, he had little interest in the every-day process of making steel. [Please select]
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--A Bessemer Converter] _Bessemer steel_ is made by heating iron until all the undesirable elements are burned out by air blasts which furnish the necessary oxygen. [Please select]
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