Pneumatic message system...
SCIENTIFIC AMERICAN, New York, March 24, 1877 The front page features a large illustration "Pneumatic Transmission in New York City" with an accompanying article and more illustrations inside. Inside the issue is "New Experiments in Mechanical Flight" with illustrations; "Houyoux' Rotary Pump"; and more illustrations, articles and advertisements.
Complete in 16 pages and in nice condition.
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