USRE12141E - Reissued aug - Google Patents

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Publication number
USRE12141E
USRE12141E US RE12141 E USRE12141 E US RE12141E
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US
United States
Prior art keywords
circuit
frequency
resonant
energy
condenser
Prior art date
Application number
Other languages
English (en)
Inventor
John Stone Stone
Original Assignee
The stone Telegraph And Telephone Company
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  • MASSACHUSETTS ASSIGNOR ,lO THE STONE TELEGRAPH AND TELEPHONE coMPA Y, or BOSTON, .nAssA CH USETTS.
  • My invention relates to the art of wireless [0 or space telegraphy-c'. a, to'theart of trans-- mitting intelligence from one station to another by means of free or unguided electromagnetic signal -waves or waves which are developed byproducing electric vibrations X5 in an elevated conductor, preferably verticslly elevated, and which are not guided to their destination by wires, as'in the system of telegraphy most commonly practiced today.
  • Th'eobject of the present invention is to 2-; .realizefa system in'which the transmitting-- stations may selectively transmit their sig nals each to a particular receiving-station simultaneously or otherwise without mutual. interference.
  • each of a plurality of transmitting and receiving stations in such a system may be enabled to selectively place itself in communication with any other station to the exclusion ofall. remaining stations.
  • the'object of the present in-' vention to so construct and proportion the .electrorec'eptive device with reference to the receiving-circuit in which it is included that sired frequency.
  • the translating apparatus at the receiving-station is-caused to be selectively responsive to signal-waves of butasingle frequency, so that the transmitting apparatus corre 'sponds to a tuning-fork sending but a single musical tone, and .the receiving apparatus corresponds to an acousticresonator capable of absorbing the energy of that single musical tone. only.
  • this receiving-station will respond to and be capable of selectively receiving messages from that particular transmitting-elation to the exclusion of messages simultaneously or otherwise. sent from other transmitting-stations in the neighborhood which generate electromagnetic waves of other frequencies.
  • the operator at the transmitting or receiving station mayyat will adjust the apparatus at his command in such a way as to place himself in communication with any one of a number of stations in the neighborhood by bringing his apparatus into resonan-cs with the frequency employed by the station with which intercommuuication is'desired.
  • V represents an elevated conductor or vertical oscillator.
  • .M M M, M are induction-coils or transformers.
  • L L L and L, L, L are auxiliary induc anc'e-coils.
  • O C C" and C, C, C, are condensers.
  • I B is a'battery in Figure 2
  • 7 is a bat tery in Fig. 4.
  • Ris a relay in Fig. 2, and 6 is a relay or sounder in-Fig. 4.
  • ' P is a Plant battery or condenser of large v capacity.
  • E is an earth connection.
  • Fig. 1 is a reproduction of Fig. 12 of-the drawings of case Serial No. 4,505and case Serial No; 44,384, above mentioned. It is a diagram illustrating the connection of a condenser-telephone at a receiving-station.
  • Fig. 2 is a diagram illustrating the application of a condenser-receiver to a system whereby several receiving-stations associated with a single elevated conductor may select? ively receive the energy of electromagnetic signal-waves of ditferent frequencies, each in a particular electro receptive or translating device, to the exclusion of the energy of electromagnetic waves of ditferent frequencies.
  • denser-telephone receiver used as a tuning-- .condenser in a resonant receiving-circuit.
  • Figs. 3 and 4 are diagrams illustrating the tuning-condenser of a resonant circuit used as a receiver.
  • Fig. 5 shows a form of. the well -known con- With reference to Fig. 1 attention is calljed to the fact that in the specification and drawings ofmyapplication Serial No. 4,505, above mentioned, it was-pointed out that.
  • the armature 5 is fixed, and the armature frequency as thebranch C, L, to the circuit C, 'L", M',, which is made resoas a capacity by which the circuit C L I, is made resonant to the desired frequency.
  • Fig. 3 is shown one form of the translating device, wherein the light from the lamp 1, reflected by the mirror 2 on the moving armature 3 of the tuning-condenser O, records the movement of said armature on scale 4 when a current flows in the circuit M, L",..
  • Fig. 4 the movable armature 3 closes the circuit of relay or sounder 6 by making contact with the post 9'.
  • This local circuit is supplied with anydesirable amount of energy from the battery 7 by the connection at its terminals to the resistance 8.
  • the energy of the vibrations will'be' received in that branch to the exclusion of thebranch G, L, M, which is made resonant to a different frequency.
  • the energy so received in branch 0 L M. is communicated, by means of the induction-coil M, to'the circuit C M L. M, which is made resonant to the same frequency 'as' the branch circuit C L M, and thence the energy is communicated to the circuit C L" M, which is likewise made resonant to the same frequency as that of the branches 0 M L M and C L M.
  • circuit C" L",M operates an elect-r0 receptive or translating device, (indicated at K.) It the electromagnetic waves impinging upon the elevlatedconductor V be of the frequency to which the branch circuit C, L, M, is made resonant, the energy ofthe resulting .vibration in the elevated conductor V will be received in' that branch to the ex--.. clusion of the branch 0 L M, which is made resonant to a dilTerent frequency.
  • the energy so received by the branch 0, L, M will be communicated to the'ci'rcuit C, M L, M,, which is made resonant to the same M,, and thexi'ce nant to the same frequency as the circuits- C',*M,.L, M and 0, L M Energyso re- 1o 'rent.
  • the battery B is thereby permitted to develop a current in The function of the Plant battery or condenser P is simply to provide a low impedance or short circuit for the electric vibrations, while preventingthe battery B'from normally developing a This relay by its operation may cause a telegraphic sounder or other telegraphic receiver to respond, and they may also set in motion a tapper or decoherer, by which the coherer is restored to resistance.
  • the electro receptive ortranslating device shown at 0 Fig. 2 is primarily a tuning condenser for the circuit C", L M ⁇ ; but it also serves to make evident the presence of It consists of a fixed armature or electrode and a movable armature or electrode. It electrical yibrations be of the frequency to which the circuit is made resonant, the electrodes of C,
  • This motion may be utilized to close a local circuit, and thereby operate a telegraphic relay or sounder, or it may be caused to deflect a beam of light reflected from its surface.
  • the normal capacity'of C is determined by the condition that it shall serve to tune the circuit with which it is associated, but leaves the dimensions of its armatures and their separation undetermined. in order to get the maximum sensitiveness in the instrument, the separation between the opposing surfaces of the armatures is made as small as practicable, and consequently, therefore, the area of the armature-shrfaces is also a By these N10; is the entire potential energy of the vibratory current in i l l l i i j i i the circuit C L", M is inade available to operate the electric translating device, and since the armatures are very close to each other the rate of change of the energy produced by the motion of the movable armature is at a maximum. The available force to produce this motion is thus made as great as possible.

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