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Microscope for observing the divisions on Mathematical Instruments,

as made by JI. Troughton.

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Designed by J. John Smenton.

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Rainal by permission from the original designs in promerion "Sirkuseph Buankur

, X.B. Pary.he.helin.

Learyl Lavadon Published by Langman, thoor how dlhme, rebel

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