ScientificAmerican1923-10.jpg Scientific American 1913-03-22ThumbnailsScientific American 1926-09Scientific American 1913-03-22ThumbnailsScientific American 1926-09Scientific American 1913-03-22ThumbnailsScientific American 1926-09Scientific American 1913-03-22ThumbnailsScientific American 1926-09
Where fire-resistant roofing shingles must make good their claim. Testing in a standards laboratory.



Artist: Howard V. Brown

Source: Steve Kirch, collector, and creator of this website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner