ESTABLISHED 1845. MUNN & C Editors and Proprietors. PUBLISHED WEEKLY AT TERMS FOR THE SCIENTIFIC AMERICAN. The Scientific American Supplement Scientific American Export Edition. Contents. 1%Tc:). BOA For the Week ending. October 29 1881. PATENT REFORM. HAMILTON E. TOWLE The Microphone in Observatories A Large Refrigerating Machine. The Lighthouse Service. A Railway Injured by an Earthquake. Constant Sources of Electricity. Angular Distance or Colors. Underground Telegraph in Philadelphia., 1881-10-29
ESTABLISHED 1845. MUNN & C Editors and Proprietors. PUBLISHED WEEKLY AT TERMS FOR THE SCIENTIFIC AMERICAN. The Scientific American Supplement Scientific American Export Edition. Contents. 1%Tc:). BOA For the Week ending. October 29 1881. PATENT REFORM. HAMILTON E. TOWLE The Microphone in Observatories A Large Refrigerating Machine. The Lighthouse Service. A Railway Injured by an Earthquake. Constant Sources of Electricity. Angular Distance or Colors. Underground Telegraph in Philadelphia., 1881-10-29
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