Subscriber.
Answer.—Eli Whitney, a graduate of Yale College in 1792, was induced to invent a machine for cleaning cotton by the widow of Nathaniel Greene, with whom he boarded while studying law. He patented the cotton-gin, but the idea was stolen by other parties, and it was only after years of litigation that he obtained the $50,000 which had been voted him for the invention by the Legislature of Georgia. In 1793 he established a manufactory for the machine near Washington, Ga., but five years later he turned his attention to the improvement of firearms, reaping a fortune therefrom.
ISINGLASS.
Glenallin, D. T.
Please tell me how isinglass is made, and whether the raw material is valuable.
A. H. Chase.
Answer.—The raw material of isinglass is the air bladders or sounds of fish, and is invaluable except for this one purpose. In Russia, where the finest isinglass is made, the sounds of the sturgeon are cut open and steeped in water until the outer membrane separates from the inner; then the latter is washed and dried in the sun. The sounds of the common cod, the hake, and other gadidae are also used for isinglass.
MOCHA ISLAND.