US 767993 A
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PATBNTED AUG. 16, 1904.
v No. 767,993.
- J. s. STONE. I
- SPACE TELEGRAPHY.
APPLIUATIOZ! FILED JAN. 15. 1904.
in a souorous circuit and of impressing corre ponding o cillations in a main line or sigu 'v liL-tli j ct of that invention he.- ing to'reahze. telephonic transmission over denser C overdischarges.till it receives a charge in the oppositedirectionalmost equal to the initial charge. 'lhe sparlt' then ceases to pass across the space at .\l', and the generasnch signaling-circuit l' vatiation of the;
amplitude of an osci lator current of inaudihly high fre uency travt'rrsing the circuit. such variation corresponding to the sound vilo'ations ol' the speech to he transmitted.
l lind that in the art of ireless telegraphv great advantages accrue h v impressing a contor (t proceeds to charge in the initial direction till the potential dill'erence at .\l' is 3 again sullicient to produce a disruptive distinuous oscillatouv force upon the el vated l conductor in contradi tiuction to ])(I'l()tll\'illl impressing such oscillatory force upon said elevated conductor in the manner heremhefore hrietly set forth.
, amplitude of electrical oscillations will result The apparatus and method of its operation may best he understood h v having reference to the drawings which accompany and form a part of this speciticaticn and which illustrate tliagramaticallv one form of apparatus \vlicrehy th herein-descril)cd method may he conveniently carried out. however, forms uspart of this invention, having heen claimed in my application, Seriai .\'o. lazuli". tiled -.\'ovunher 25, 1903.
Figure] rcm-esents a means of continuously inn-ncssing periodic clectromotive forces upon the elevated conductor syst m h 1'. Fig. 2 represents a means of continuously impressing simple harmonic electromotive forces upon the elevated conductor s m S l).
In the ligures, V is an elevated cotnluctor. A is a key. l l are transformers whose windings are respectively I S and P'S'. are condensers. .\l' is a spark-gap. (i isa direct-current generator.
The circuit 1/ (i is a circuit of large electroniotive force and high resistance.
The circuit l l. .\l' is a sonorous circuit. and in Fig. 2 the circuit C l" L 5 is a resonant weeding-out circuit, the general function of which was lirst s t forth h,\' Dr. Louis l)uncan in a paper pnhlished in the yivmsw- This apparatus.
in the vertical s \-stem.and theamplitudeot' said oscillations will he far greater than if a train of a limited numhcr of el ctric oscillations he so impressed upon the elevated conductor s vstem. The amplitude of the elcetron'utgnetic waves radiated from said elevated conductor is therefore correspondingl) greater and uniform.
in the system shown in Fig. 2 the resonant circuit C l" L' S is attuned to the .t'requency of the electric oscillations developed by the electric strength of the intervening medium when a disruptive dis harge talt'es place at.
that point. Whensuchadisruptivedischarge f taltcs place. the resistance at that point hecomcs ahrnptLv and enormously diminished. Owing to the resistance of the generator (i, or, more generally speaking, to the imptalance ol' the circuit M a (i I}, the potential difference at Xl' immediately hecomes quite insignilicant. By virtue of the electromagnetic inertia of the circuit Al e U 1 L I: the consonorous cir hit (7 l l. .\l'. and therefore renders the oscillator clectromotive forces impressed upon the vertical conductor simple harmo do in form. The function of the permanentmagnet 11 s is the usual function of such magnet in connection with a spark-gal 1'. of extinguishing the spark.
l claim 1, The method of transmitting signals hy electromagnetic waves which cousistsin developing a snhstantially continuous train of electrical oscillations, controlling said train of tltClliCill oscillations in accordance with the signal to he transmitted. impressing said electrical oscillations upon an elevated conductor and then-Irv developing a substantially continuous train of elm-tromagnetic wares modilied in accordance with thesignal to he transmitted.
2'. The method of developing a coutimlous train of electronlagnetic waves which consi ts in deriving a continuous train of electrical os cillations from a source of unidirectional electromotive t'oree, impressing said train of elec trical oscillations upon an elevated conductor and therehy transmitting a continuous train of electromagnetic waves.
3. The method of developing a continuous train of electromagnetic waves which consists in deriving a continuous train of electrical oscillations from a source of unidirectional electromotivc force, impressing said train of electrical oscillations upon a resonant circuit attuned to the frequenev of said oscillations, and impressing the oscillations developed in the resonant circuit upon an elevated conductor.
4. The method of developing electromagnetic waves which consists in charging a conl\ It is hereby certified that in Letters Patent No. 767.993, granted August 16, 1904,
, upon the application of John Stone Stone, of Cambridge. Massachusetts, for an lulprovement in "Space Telegraphy, errors appear in the printed specification. requiring v .53 E correction, as follows: On page 1, line 23,1he dash after the word "coil should be :5 t I i stricken out, and in line. 24,5:1'me page, a Collllllfl. should be inserted after the word a: 3 generator; and that the smd Letters Patent should he read with these corrections H ES 5 thereln that the same may conlorln to the record of the case In the Patent Olhce. -1 3 l i Signed and sealed this 4th day of' July, A. 1)., 1905.
w [SEAL] F. I. ALLEN, E: v v Q 3 Commissioner of Patents. H I o 1 Q) a i L- S- i 1