Anyone sendIng a sketch and eecription may qulCk1y ascertain our opinion free whether a tnvention is probably ptt entable. Communlca-tionsstrictlyconfldentfal. HANDBOOK onPatenta sent free. Old eest agency lor securin g patents. Pate nts taken througf Munn & Co. rive special notice. without charge, In the Stitntific Jmtritan. A handsomelY illustr at e d weekly. L&rgeet cr. cnlation of any I stific journal. Terms, e8 i year: f our months,. $1. Sold by all newsdealers- 11INr 00 . 618**1ulo York Bnoob Offloe. ft* r l Washington. D. C.
This article was originally published with the title "Patents" in Scientific American 97, 24, 451 (December 1907)