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Boyle, Robert, 1627-1691

"Experiments and Considerations Touching Colours (1664)"


[35] These were brought in and Read before the Royal Society, (the Day
following) _Oct._ 28. 1663.
[36] _The Stone it self being to be shown to the Royal Society, when the
Observations were deliver'd, I was willing (being in haste) to omit the
Description of it, which is in short, That it was a Flat or Table
Diamond, of about a third part of an Inch in length, and somewhat less in
breadth, that it was a Dull Stone, and of a very bad Water, having in the
Day time very little of the Vividness of ev'n ordinary Diamonds, and
being Blemished with a whitish Cloud about the middle of it, which
covered near a third part of the Stone._
[37] _Hast made me forget to take notice that I went abroad the same
Morning, the Sun shining forth clear enough, to look upon the Diamond
though a_ Microscope, _that I might try whether by that Magnifying Glass
any thing of peculiar could be discern'd in the Texture of the Stone, and
especially of the whitish Cloud that possest a good part of it. But for
all my attention I could not discover any peculiarity worth mentioning._
Secondly, The Candles being removed, I could not in a Dark place discern
the Stone to have any Light, when I looked on it, without having Rubb'd or
otherwise prepar'd it.


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