DE30288C - Telephone transmission system - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 21: Electrical apparatus.

J. BUBBE in HAMBURG. Telephone transmission system.

Patented in the German Empire on April 6, 1884.

The transfer of a telephone function from one to the other taking place in this system on the one hand, is based on a further second line section and its end telephone the general telephone theory, according to which the action of sound waves on the membrane excited fluctuations in magnetism, which in the respectively. Wire roll induce current waves, which propagate in the ladder and so on, but on the other hand to a multiplication of the Interaction between magnetic induction and the effect of the current wave as a result of the current branching, which allows the peculiar connection of the wire rolls of this system.

As shown in the accompanying drawing, there are two telephone systems I and II opposite each other, the magnets a ₁ and a _{n of} which have a double membrane o, 0O ₁ , 0, oo _n and with each pole N ₁ S ₁ N ₁₁ S ₁₁ Affect in ₁ Vi _11. So the positive current impulse arriving in section 1, RoIIe ^, (as you can follow the arrowheads in the circuit diagram) does not only shake the membrane m _{/? As a result of its fluctuating excitation.} but also the In ₁₁ ; the latter therefore also exerts its effect on the pole a S _{11 of} the magnet a _u , and as a result a current impulse induced in the role b _n , section 1, will pass through the line II and put the terminal telephone II into operation. Furthermore, it allows the connection of the wire reels by means of the on -switch attached to the box cover q , so that the current pulse arriving at r ' branches there and not only runs through the wire division of the reel b _t , but also the section 1 of the reel c _jT where it acts , then crosses section 2 of roll b _n and only then goes to earth. The effect of this current impulse or this current wave (in division 2, role b _n ) not only corresponds to the effect which division of the same role of the membrane Ui ₁₁ suffers, but also takes place at one and the same moment; therefore one impulse reinforces the other. The current impulse, which affects division ι of roll bj , also passes through division 2 of roll C ₁ before it goes to earth, and has an intensifying effect on the magnetic fluctuations in nucleus Ci ₁ S. The one in division 1, roll b _n As a result of the branching, the occurring current impulse is communicated to the whole of the roller C ₁₁ , from where it finds its way to earth.

Conversely, the one just described barks The process takes place when the end telephone II sends a current pulse through line II, however, the transmitted impulses are always directed to earth on the transmission and new, reinforced ones go into the second line and bring the second end telephone to answer.

The peculiar construction of the magnets, which in the right-angled position of the'bezw. Pole to each other, in the way, as can be seen from the drawing, allows it is also possible to use the transmission system as a control apparatus by not being able to only listening to the correspondence maintained between the terminals, but possibly can speak to each side even without any further device.

This on the basis of the theorem: Sound rays bounce off at the same angle at which they strike, the constructed mouthpiece p _r or p _n increases the effect of the sound rays when speaking into it, in that the latter revolves around the center of the membrane (the most suitable point for this effect) concentrate more. This construction of the mouthpiece also facilitates eavesdropping, in that the ear placed on it is less affected by a disturbing background noise.

The illustrated double diaphragm 0.00, on which the upper plate is cut out, promotes a sound amplification in that the waves are thrown back from one plate to the other, whereby the vibrations of the plates are greater.

Finally, by switching on the transmission system, the communication distance by telephone is doubled. The application this transmission can therefore only be of advantage for telephone traffic, all the more so because its function always keeps the same pace with the function of the end telephones and with a good setting no regulation required, as would such fluctuating battery currents.

The adjustment of the magnets in relation to their distance from the membranes is mediated by the screws I ₁ I ₁₁ U ₁ and k _n . The brass angles gj and gjj, as well as the pieces of wood tj and t _n serve the magnets λ _; and a _n as a fixed bearing, d is a wooden plate cut out round for the purpose of accommodating the membranes In ₁ and m _n , in the square as large as the clear width of the wooden box K, in which the whole system is accommodated, e and f denote the rings for tightening the membranes.

The resistances of all the wire sections are each 200 units, but as a result after branching, the resistance of each whole roll is reduced to 200 units.

. The on / off switch consists of brass rails that are attached to the box cover with screws will.

The brass angles g _l g _n are to be screwed onto the pieces of wood t. The latter are fixed laterally by angle pieces u , but the pieces t must give way to regulation forwards or backwards. The height of the pieces of wood plus the brass angle corresponds to the position of the poles JV and S exactly in front of the center of the membranes.

Claims (2)

Patent Claims: 1. The arrangement of two horseshoe-shaped telephones Magnets with pole pieces so that one pole of one magnet is the opposite pole of the other magnet closely facing, with two vibrating membranes between these poles while the other two Pole shoes, bent at right angles, stand parallel to each other and each in front of you have a membrane that mediates the transmission of sound. 2. The arrangement of a branch circuit, each in two consecutive groups disassembled pole piece roller resistors of the aforementioned magnets, so that in each circuit intended for these magnets one branch of the current has both pole shoes of the magnet in question, the other branch only the one bent at right angles The pole piece of the same magnet and the straight pole piece of the second magnet encircles which arrangement, · by placing it at the occurrence of each current wave a simultaneous impairment of the forces of both magnets As a result, the transfer is mediated, in conjunction with the functions resulting from the arrangement under 1. 1 sheet of drawings.