1917 Scientific American Cover: Making Battleship 16 inch gun at steel factory

Description

This is an original Scientific American magazine cover from April 7, 1917  showing the making of a 16 inch gun at a steel factory and the process of oil tempering the inner tube.  A great image and note that this is not the full magazine but just the cover.  This early 20th century industrial cover is 11 x 15 inches and would look great framed as part of your collection!
I have been a trusted vintage paper dealer since 1989 and been on eBay since 1997.  I have primarily sold in antique malls at San Francisco, San Diego, Monterey, Napa, Monterey, Portland, and Ellensburg.  I have sold over 30,000 advertisements to many happy customers, museums, galleries, and private collections.  If you are not happy with your purchase, please send it back for a full refund.
I am a historian and educator by trade and deal in paper as a hobby.
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The item comes in an archival protective plastic sleeve with a white acid-free backing board.  It will be shipped in a strong and rigid mailer made in the USA out of 100% recyclable materials especially for flat shipping.  It will be marked as special photo materials - DO NOT BEND.  All items have a money-back guarantee - if you don't like the item, then pay for shipping and handling for a refund.  I ship worldwide.