. Scientific American Volume 16 Number 12 (March 1867) . jumps at intervals, apparently picking certain sounds frommy utterance to which it can respond, while it is unaffected by others. In ourexperiments down stairs, we have called this the vowel flame, because thediherent vowel sounds affect it differently. I utter the words boot, boat, andbeat in succession. To the first there is no response; to the second, the liamestarts; but by the third and fourth it is thrown into violent commotion ; thesound Ah 1 is still more powerful, the vowel sounds characterised by thesharpest overtones being the
. Scientific American Volume 16 Number 12 (March 1867) . jumps at intervals, apparently picking certain sounds frommy utterance to which it can respond, while it is unaffected by others. In ourexperiments down stairs, we have called this the vowel flame, because thediherent vowel sounds affect it differently. I utter the words boot, boat, andbeat in succession. To the first there is no response; to the second, the liamestarts; but by the third and fourth it is thrown into violent commotion ; thesound Ah 1 is still more powerful, the vowel sounds characterised by thesharpest overtones being the most powerful excitants of the flame. If themost distant person in the room were to lavor me with a hiss, the flamewould be Instantly shivered Into tumult. This hissing sound contains theprecise element* that most forcibly affect the flame. The gas issues from itsburner with a hiss, and an external sound of this character added to that of agas-jet already on the point of roaring is equivalent to an augmentation ofpressure on the issuing stream of ISSUED FROM THE U. S. PATENT OFFICE FOR THE WEEK ENDING MARCH 5, Officially for the Scientific American. PATENTS AKE GRANTED FOR SEVENTEEN TEARS, the followingbeing a schedule of fees:— On filing each Caveat , $10 On filing each application for a Patent, except tor a design $15 On issuing each original Patent $20 On appeal to Commissioner of Patents §20 On application for Reissue §30 On application for Extension of Patent $50 On granting the Extension $50 On filing a Disclaimer $10 On filing application for Design (three and a half years) $10 On filing application for Design (seven years) ..$15 On filing application for Design (fourteen years) $30 In addition to which there are some small revenue-stamp taxes. Residentsof Canada and Nova Scotia pay $500 on application. J£T Pamphlets containing the Patent Laws and full particulars of the modeof applying for Letters Patent, specifying size of model required, and
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