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according action apparatus appeared applied armature arranged articulate battery Bell called cause circuit claim closed combination communication complete conducting conductors consists constructed corresponding curve described distance electric electro-magnet employed exhibited experiments fact force further galvanic German give given greater Herr human Institute instrument intended interruptions invention inventor iron known later less lever magnet manner matter means meeting membrane metal motion musical nature needle opening original Patent Philipp Reis Physical Physical Society piece plate platinum possible practical present pressure principle produced Prof Professor Prospectus question receiver Reis's Reis's Telephone Report represented reproduced researches resistance rests says screw shown shows side similar singing sound speaking speech spiral spring station steel strip success surface telegraph Telephone tion tones transmit speech transmitter tympanum undulations varying vibrations voice wire
Page 180 - and Sciences, vol. xii. p. 7.) Yet this most imperfect machine, of which the articulation was, as a general rule, unintelligible, had, two months previously, had a patent granted to it as a new invention, the claim being for " the method of, and apparatus for, transmitting vocal or other sounds telegraphically, as herein * The following very remarkable passage occurs in the evidence given by Professor Graham Bell concerning
Page 177 - 1 a facsimile copy of the motion of the air that acted upon the membrane n.—(Specification of British Patent, No. 4765, Dec. 9th, 1876, p. 17.) A cone A is used to converge sound vibrations upon the membrane. When a sound is uttered in the cone the membrane a is set in vibration. . . . . . . and thus electrical undulations are created upon the circuit E
Page 83 - DEAR SIR ! " Friedrichsdorf. " I am very sorry not to have been in Francfort when you were there at Mr. Albert's, by whom I have been informed that you have purchased one of my newly-invented instruments (Telephons). Though I will do all in my power to give you the most ample explanations
Page 167 - APPENDIX IV. ON THE DOCTRINE OF UNDULATORY CURRENTS. " In this Specification the three words ' oscillation,' ' vibration,' and 'undulation,' are used synonymously."—Graham Bell, US Patent, No. 174, 465, filed Feb. 14, 1876. IN the preceding appendices it has been demonstrated that all that is essential in both transmitter and receiver of a Telephonic system was to be found existing in 1863 in the Telephone of
Page 17 - hollowed out, and a cone formed in this way was closed with the skin of a German sausage, which did service as a membrane. To this was fixed with a drop of sealing-wax a little strip of platinum
Page 177 - The undulatory current passing through the electromagnet f influences its armature h to copy the motion of the armature c. . . . These undulations are similar in form to the air undulations caused by the sound.
Page 83 - subject, I am sure that personal communication would have been preferable ; specially .as I was told, that you will show the apparatus at your next sientifical meeting and thus introduce the apparatus in your country. " Tunes * and sounds of any kind are only brought to our conception by the condensations and rarefactions of air or any other medium in which we may find ourselves. By
Page 43 - inventions, the original inventor obtained only insignificant results, and that it was the man who first succeeded in arranging his apparatus so as to obtain really striking results that received the honour of the discovery and rendered it popular." So far as the Count du Moncel is concerned, therefore, the claims of Philipp