The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 160
ar distant is the wood ? 9. Wishing to ascertain the depth of a cavern which could not bedescended into, a stone was dropped and seen to strike some water atthe bottom two seconds before a report was heard; how deep was thecavern ? 10. In the bombardment of a certain fortress a shell fired from… … 125. The remarkable property, possessed by certain fer-ruginous ores, of attracting iron, waswell known to the ancients. These oresvere termed Magnets^ from Mag?iesia,L town of Lydia, where they were saidto abound. This natural magnet, or, as it is gen-erally termed, lodestone, has the powerof…
Physics
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