From the Cornell Library, this is an (incomplete, but still interesting) archive of Scientific American that provides pdf images of the journal between the years of 1846 to 1869 (if you didn't gather that from the title). It features many sketches of technological feats and machinery of the day, including the Niagra Falls Suspension Bridge that originally opened in 1848, but, as featured, added on to in 1855.
The pdf to the right is taken from Vol 17, Issue 23, p 353 (Dec 7, 1867).
Main site: http://library5.library.cornell.edu/moa/browse.journals/scia.html
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