  In connection with the Scientific American, Messrs. Munn & Co. are Solicitors of American and Foreign Patents, have had 39 years' experience, and now have the largest establishment in the world. Patents are obtained on the best terms. A special notice is made in the Scientific American of all Inventions patented through this Agency, with the name and residence of the Patentee. By the immense circulation thus given, public attention is directed to the merits of the new patent, and sales or introduction often easily effected. Any person who has made a new discovery or invention can ascertain, free of charge, whether a patent can probably be obtained, by writing to Munn & Co. We also send free our Hand Book about the Patent Laws, Patents, Caveats, Trade Marks, their costs, and how procured. Address MUNN & CO.. 361 Broadway, New York. FOOTNOTES:1 A Lecture delivered at the Academy of Music, Philadelphia, under the auspices of the Franklin Institute, September 29, 1884. 2 Alluding to a moving diagram of wave motion of sound produced by a working slide for lantern projection. 3 Showing two moving diagrams, simultaneously, on the screen, depicting a wave motion of light, the other a sound vibration. 4 Exhibiting a large drawing, or chart, representing a red and a violet wave of light. 5 Since my lecture I have heard from Prof. Langley that he has measured the refrangibility by a rock salt prism, and inferred the wave length of heat rays from a "Leslie cube" (a metal vessel of hot water radiating from a blackened side). The greatest wave length he has thus found is one one-thousandth of a centimeter, which is seventeen times that of sodium light. The corresponding period is about thirty million million to the second.—W.T. 6 Exhibiting a large bowl of clear jelly with a small red wooden ball embedded in the surface near the center. 7 Showing the chromatic bands thrown upon the screen from a diffraction grating. 8 Reproduced in abridged form from the Electrical Review and the cuts from La Lumiere Electrique.—Science. 9 See Supplement No. 264 for an illustrated description. 10 Annales Industrielles. 11 A communication to the London and Provincial Photographic Association. 12 Translated from the Revue Odontologique, for the Dental Cosmos. 13 In the cuts, Nos. 6, 7, and 8 are proportionate modifications of No. 5. 14 By Professor Henry Robinson. Paper read Oct. 2, 1884, at the Congress of the Institute held at Dublin.—Building News. Transcriber's Note: Inconsistent spelling and hyphenation are as in the original. |
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