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Philosophical Transactions of the Royal Society of London
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III. Several experiments on the attrition of bodies in vacuo. Made before the Royal Society at Gresham College

    A. A. is a Ladder, such as is generally us'd in Houses. B. B. Is a Bar of Iron which passes through the Middle of the upper Step, and is fasten'd to the Back board of the Ladder by 2 Nutts and Screws thro both the Board and Iron.

    Footnotes

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