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Ch. 6:Other Gems

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MOSAIC AND PIETRA DURA.                           431
the authority of the government, for the purpose of pro­tecting the cannon and balls, exposed to the weather in the Brooklyn Navy Yard, against rust; for this purpose, when treated with the various coloring pigments,—such as oxide of manganese, umber, terra di sienna, ochre, Venetian red, ultramarine, &c,—it is admirably adapted.
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