Encyclopedia Americana

Encyclopedia Americana

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The invention of the semaphore telegraph (1792) and the introduction of flag signals for naval use sparked the ... An article by William Blair (1766-1822) in the 1819 edition of Reesa#39;s Cyclopedia gave methods of solution for various kinds of simple ... This article aroused considerable public interest in cryptography, and may have been responsible for turning the ... by the method of mathematical coordinates These methods are all fairly reliable when properly handled, but are inclined toanbsp;...

Title:Encyclopedia Americana
Publisher: - 1961

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