want Arthur and how shall we tell him of this If you who saw the wounds on Lucys throat and saw the wounds so similar on the childs at the hospital if you who saw the coffin empty last night and full today with a woman who have not change only to be more rose and more beautiful in a whole week after she dieif you know of this and know of the white figure last night that brought the child to the churchyard and yet of your own senses you did not believe how then can I expect Arthur who know none of those things to believe He doubted me when I took him from her kiss when she was dying I know he has forgiven me because in some mistaken idea I have done things that prevent him say goodbye as he ought and he may think that in some more mistaken idea this woman was buried alive and that in most mistake of all we have killed her He will then argue back that it is we mistaken ones that have killed her by our ideas and so he will be much unhappy always Yet he never can be sure and that is the worst of all And he will sometimes think that she he loved was buried alive and that will paint his dreams with horrors of what she must have suffered and again he will think that we may be right and that his so beloved was after all an UnDead No I told him once and since then I learn much Now since I know it is all true a hundred thousand times more do I know that he must pass through the bitter waters to reach the sweet He poor fellow must have one hour that will make the very face of heaven grow black to him then we can act for good all round and send him peace My mind is made up Let us go You return home for tonight to your a
heavy door There must have been some other means of entry or some one had a key for one of the locked doors Then there came the sound of many feet tramping and dying away int′ the wires without conductors are suspended to the extremities of the two flexible plates l l′ which correspond with earth and line When at rest the weight of the telephones presses the two plates l l′ on the lower contacts S S′ but when the instruments are taken up these plates press against the higher contacts The two bell wires terminate on the lower contacts those of the telephones on the higher contacts and one of the poles of the battery is connected with the lower contact on the left S′ the other with the higher contact on the right T When at rest the system is applied to the electric bell and the current sent from the opposite station will follow the circuit L l S S′ S′ l′ T so that the call will be made On taking up the two telephones the circuit of the bell system is broken and that of the telephones is established so that the current follows the course L l T t t′ T′ l′ T If only one telephone is held at a time the current is sent into the bell system of the opposite station and follows the route + P S l L T l′ T′ t P In this way the three actions necessary for calling corresponding and enabling the corresponding instrument to give a call are almost involuntarily made System by MM Bréguet and RooseveltIn the system established by the Paris agents of the Bell company the arrangement resembles the one just described except that there is only one spring commu
two years ago the newspapers announced with some pomp that a speaking machine had reached Paris which far surpassed Vaucansons duck and which would attract general attention Unfortunately the invention was not in the first instance brought forward with any scientific authority and was soon relegated to take a place among the curiosities exhibited by conjurors In a country so essentially critical and sceptical as France there are always those who profess incredulity and who will even resist evidence and it was asserted that the machine only spoke because its exhibitor was an able ventriloquist This is an old assertion which has lately been made with reference to the phonograph Some scientific papers echoed the absurdity and the speaking machine was so discredited that it is now unnoticed although it is a most ingenious and interesting conception When will our country be cured of the error of denying everything without due examination Since we ourselves only judge of things after having seriously considered them we think it just to vindicate the truth as to Mr Fabers machine and this can only be done by an exact description of it As I said in the last chapter there is a great difference between the production and the reproduction of a sound and a machine like the phonograph adapted for the reproduction of sound may differ essentially from a machine which really speaks In fact the reproduction even of articulate sounds may be very simple as soon as we possess the means of stereotyping the vibrations of air necessary to transmit these so
speak without a permanent magnet yet with an instrument of the usual construction the sound ceases when the magnet is withdrawn and replaced by a cylinder of soft iron In order to restore the voice of the telephone it is enough to approach the pole of a permanent magnet to the cylinder of soft iron It follows from these experiments that a Bell telephone cannot act properly unless the disk is subjected to an initial magnetic tension obtained by means of a permanent magnet It is easy to deduce this assertion from a consideration of the theory The assertion may be true in the case of Bell telephones which are worked by extremely weak currents but when these currents are relatively strong all electromagnets will reproduce speech perfectly and we have seen that M Ader made a telephone with the ordinary electromagnet which acted perfectly The action of the currents sent through the helix of a telephone can be easily explained Whatever may be the magnetic conditions of the bar the induced currents of different intensity which act upon it produce modifications in its magnetic state and hence the molecular vibrations follow from contraction and expansion These vibrations are likewise produced in the armature under the influence of the magnetisations and demagnetisations which are produced by the magnetic action of the core and they contribute to the vibrations of the core itself while at the same time the modifications in the magnetic condition of the system are increased by the reaction of the two magnetic parts upon each other When the bar is made of soft iron the induced currents act by creating magnetisations of greater or less energy followed by demagnetisations which are the more prompt since inverse currents always succeed to those which have been active and this causes the alternations