Tom is applying for a job as a signalman for the local railroad, and is told to meet the inspector at the signal box. The inspector decides to give Tom a pop quiz, asking, "What would you do if you realized that two trains were heading towards ea... Read more of Signal man's test at Free Jokes.caInformational Site Network Informational
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Blue Ashes Or Mountain Blue

are both hydrated carbonates of copper, the first being artificially
prepared, and the second found native in Cumberland. Neither is durable,
especially in oil; and, as pigments, both are precisely of the character
of verditer. By treating the natural malachite green with an alkali, it
may be converted into blue.

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