ADVERTISEMENTS

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Inside Page, each insertion 75 cents a line.

Back Page, each insertion $1.00 a line.

_Engravings may head advertisements at the same rate per line, by

measurement, as the letter press. Advertisements must be received

at publication office as early as Friday morning to appear in next

issue._

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Scientific American, Vol. XXXVII.—No. 2. [New Series.], July 14, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 121 / 213 题