Encyclopedia of Practical Receipts and Processes

How to silver a mirror, brew ginger beer, kill moths, make fireworks, tan a hide, bronze iron, cure a ham and clean a straw hat: William B. Dick's numbered encyclopedia answered the questions a nineteenth-century household actually had.

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Velocity of Sound

In air, 1.142 fect per second. In water, 4,900 feet.

Through iron, 17,500 feet. Through copper, 10,378 feet. Through wood, 12,000 to 16,000 feet. 66 20 to 25 " 80 " 15 to 20 " 77 to 78 Under 15 " 75 to 77

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