"Testing Materials," #1 of 5, Page 1, 1911         
Here is the first of five frames of a two-page cover article entitled "Testing Materials Of Construction: How The Pennsylvania Railroad Guards Against Loss By Poor Materials." It was published originally in Supplement No. 1866 of the "Scientific American" dated 07 October 1911, page 1.
Date: 10/7/1911 Location: Altoona, PA Views: 92 Collection Of:   Thomas C. Ayers
Author:  Thomas C. Ayers
"Testing Materials," #1 of 5, Page 1, 1911
Picture Categories: This picture is part of album:  PRR: "Testing Materials" ~ October 1911
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