



Produced by J. Niehof, D. Kretz, J. Sutherland, and
Distributed Proofreaders











[Illustration]




SCIENTIFIC AMERICAN SUPPLEMENT NO. 433




NEW YORK, APRIL 19, 1884

Scientific American Supplement. Vol. XVII, No. 433.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year