. Scientific American Volume 86 Number 05 (February 1902) . 50 YEARS EXPERIENCE. Trade MarksDesigns Copyrights Ac. Anyone sending a sketch and description mayquickly ascertain our opinion free whether aninvention ts probably patentable. Communica-tions strictly confidential. Handbook on Patentssent free. Oldest agency for securing patents. Patents taken through Munn & Co. receivespecial notice, without charge, in the Scientific American. A handsomely illustrated weekly. Larrest cir-culation of any scientific journal. Terms. $3 ayear; four months, II. Sold by all newsdealers. MUNN & *•«*■
. Scientific American Volume 86 Number 05 (February 1902) . 50 YEARS EXPERIENCE. Trade MarksDesigns Copyrights Ac. Anyone sending a sketch and description mayquickly ascertain our opinion free whether aninvention ts probably patentable. Communica-tions strictly confidential. Handbook on Patentssent free. Oldest agency for securing patents. Patents taken through Munn & Co. receivespecial notice, without charge, in the Scientific American. A handsomely illustrated weekly. Larrest cir-culation of any scientific journal. Terms. $3 ayear; four months, II. Sold by all newsdealers. MUNN & *•«*■« New York Branch Office. 825 F St. Washington. D. C. Notes and Queries. hints to correspondents. Names and Address must accompany all letters orno attention will be paid thereto. This Is forour information mid not for publication. References to former articles or answers should givedate of paper and page or number of question. Inquiries not answered in reasonable time should berepeated; correspondents will bear in mind thatsome answers require not a little rese
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