1909 Scientific American Supp July 31-Unaka Springs TN: Blau gas; pantograph;

Scientific American SupplementJuly 31, 1909This large issue (12X16") is inexcellent condition. The Supplement was similar to the regular Scientific American except the ads were deleted and more photos were included in the larger articles. Some of the articles inside are:The cover showsthe most costly railroad in America with 12 more photos inside; Unaka Springs TN; The invention of the pantograph; Fireproofing wood and textiles; the microscope in engineering; Blau gas; Animal filters and strainers; Algebraicsymbolism; Colored fireworks; ; . a number of other articles and photos..Most Scientific Americans in stock 1897-present. Most Supplements in stock 1901 to 1919. Inquire about other issues.Chosen Reflections/ Million magazines, Kaufman Texas 75142.In the trade since 1976. Over one million Magazines and one million original prints in stock 1843 to present.