HD Thoreau darbeliai
It turns out that, before setting off for Harvard College, Henry David Thoreau devoted quite a bit of time to figuring out how to blend graphite powder and clay into a pencil that could compete with the best English and French products. He and his father were very successful pencil merchants in the 1840s. As cheap German imports made the business less profitable the Thoreaus moved into supplying graphite powder for electrotype printing. In 1853 Thoreau's friends asked him why he'd stopped making pencils. He responded "Why should I? I would not do again what I have done once."
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