ADVERTISEMENTS.

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, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 147 / 203 题