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SCIENTIFIC AMERICAN SUPPLEMENT NO. 492




NEW YORK, JUNE 6, 1885.

Scientific American Supplement. Vol. XIX, No. 492.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.


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TABLE OF CONTENTS.

I. ENGINEERING AND MECHANICS.--The New Spanish Artillery.--2
engravings.

Qualitative Tests for Steel Rails.--By L. TETMAJER.