ADVERTISEMENTS.
INSIDE PAGE, EACH INSERTION--75 CENTS A LINE
BACK PAGE, EACH INSERTION--$1.00 A LINE.
(About eight words to 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 Thursday morning to appear in next
issue._
Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 131 / 162 题