US943960A - System of directed wireless telegraphy. - Google Patents

Description

Patented Dec. 21, 1909.

E. BELLINI & A. TOSI. I SYSTEM OF DIRECTED WIRELES$ TELEGBAPHY.

APPLICATION FILED OOT. I 1907.

W/ rzvIssES w, p JO, Jmnw UNITED STATES PATENT OFFICE.

ETTORE BELLINI AND ALESSANDRO TOSI, OF PARIS, FRANCE.

SYSTEM or DIRECTED WIRELESS TELEGRAPHY.

ing is a specification.

()ur invention relates to a system of. wireless telegraphy or system employing the energy under the form of electromagnetic waves which permits a receiving station providedwith two or several dirigible aerialsto radiate mainly in any given direction without-it being necessary either to turn-the dirigible aerials, which is not 'ap plicable in practice, or to employ a greatnumber of dirigible aerials, which is very compl catedand has besides mconvemences as regards the working.

'By the term diriglble aerial -we mean any aerial cohductor having the property of radiating or receiving waves with different intensities according to the different directions. -,A closed oscillation circuit or a pair. of antennae connected together by a conductor constitutes respectively a ,dirigible aerial.

To describe the parts of our invention, we have supposed that it is applied to the case in which the dirigible aerials are closed os-,

cillation circuits, but of course all the parts of the installation are applicable in the same manner, to the other dirigible aerials.

In the annexed drawing, Figure 1 represents a diagrammatic perspective partial iew ofa transmitting station according to our invention comprising two dirigible aerials. Fi s. 2 and 3 are diagrammatic plan views showing the devices enabling radiation in any given direction, without causing the dirigible aerials to turn.

As is well known, a directed wireless telegraphy station must generally be capable of radiating in any given direction. Up to now, it has been necessary for this pur ose either to turn the dirigible aerial according to the direction of the receiving station, or to arrange a eat number of dirigible aerials in the diflerent directions. According to our invention, it is on the contrary possible to radiate in any given d1rection with a very small number of dirigible aerials (two for instance) and without'causing the aerials to turn. We employ for this Specification ot letters Patent.

Patented Dec. 21, 1909.

Application filed October 1, 1907. Serial No. 395,866

' purpose two or more dirigible aerials in a fixed position, which are excited at the same time and in such a manner that the partial electromagnetic fields roduced by each circuit) superpose themse ves-and determine a resulting field which is directed in the required direction. As it is possibly to vary the excitation of the-aerials, the direction of the resulting field may thus be varied, that isto say the direction of the transmission.

VVehave shown in the drawing two different arrangements which we may employ to realize the purpose set forth. Inboth cases, we have supposed that the dirigible ,aerials consist of two closed oscillation Cllfcuits of triangular shape A B B A and A B B A arranged respectively in two,

perpendicular planes.

1 and 2) we employ in combination with said dirigible aerials an apparatus of the inductive excitation type composed of two fixed coils m and n perpendicular one to each other. Each coil is connected respectively to one of the dirigible aerials through terminals b b and b b. A third coil 8 is placed within the free space between the coils m and n and is capable of rotating about the axis 0 orintersection of the median planes of the coils m and n. It is traversed by the oscillating currentswhich may be produced by any suitable means.

Qindicates the condenser of the exciting circuit; 1 the spark-gap; P and S the pri-' mary and secondary winding of a trans-' former; T the manipulator; Sf a self .induction coil; Al the energy generator (alternator V Vhen the coil 8 is traversed by an oscillating current, electro -motive force will take place in both coils m and n, the values and phases of said E. M. F. depending on the osition of the coil 8 with relation to the two xed coils mI'and n. As these coils are conof the component fields may be varied at will f andconsequently the direction of the resulting field, that isto say, the direction of'the waves radiated.

Inthesecond arrangement illustrated in Fig. 3, the apparatus employed is of the direct excitation type. It consists of a continuous spiral wound on a torus. The points 6 Z) and b b of the aerial circuits, instead of being connected to the coils m and n of the 10 foregoing apparatus, are connected to the pemts 0 c and c c" of the torus at the ends of two-perpendicular diameters. Two brushes f 7" insulated one from the other and invariably fixed at 180 may rotate in continuous contact with the torus, about the axis 0. The brushes are connected by means of rings 9 g and contactv pieces h h to the oscillationsource which maybe of any kind and which in the drawing is shown diagrammatically as being of the same kind as that of Fig; 2. The aerials are in this case excited by the oscillation circuit of direct excitation, Which, as is known, may be considered as a double excitation, viz.: magnetic and galvanic, the magnetic excitation being far superior to the galvanic. By causing the position of the brushes f f to be varied, the degrees of connection between the primary excitation circuitand each aerial circuit are varied. When the brushes f f are arranged according to c c, the degree of connection is maximum for the aerial connected to thepbints 0 0 and null for the other.- The latter does not work therefore and the transmiseaa, eeo

sion takes place through the aerial connected Having now described our invention, what we claim as new and desire to secure by Let-- ters Patent is! p A system of directed transmission for wireless telegraphy stations, comprising for the aerial part of the transmitting station several dirigible aerials in a fixed position, combined with fixed windings inserted in the conducting part of the aerials, a wave generator and a rotary device which is connected to the wave generator and which excites the fixed windings, substantially as described and for the purpose set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

ETTORE BELLINI. ALESSANDRO TOSI. Witnesses:

ANTOINE LAvoIx, Louis Moses.

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