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._
-->The publishers of this paper guarantee to advertisers a circulation
of not less than 50,000 copies every weekly issue.
_Fifth Edition Just Ready._
Scientific American, Vol. XLIII.—No. 1. [New Series.], July 3, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 106 / 157 题