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Minute machinery.

--A correspondent of the Times, writing from London, says:

‘ The most extraordinary machine in the exhibition is beyond question the one for microscopic writing. This ruables a person to write in the usual way, and to duplicate his writing a million times smaller; so small, indeed, that it is invisible to the naked eye, yet with a powerful microscope becomes so plan that every line and dot can be seen. The inventor claims that with this instrument he can copy the entire Bible twenty-two times in the space of an inch. The Astor-Library. I presume, could be transferred to a sheet of note paper. Practically it will be of great service in preventing forgeries. With one of these machines a private mark can be put on hills so minute and perfect that the forger can neither perceive nor imitate it, but the bank clerk or broker knowing where to look can at once detect that the bill is genuine. The machine is the invention of a Mr. Peters.

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