March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet l K-pe% comyzacts 904 306 3/O S747/OW A A/G. / f/6.2 WvewroR M.A. AROSEWE "awal.A77OAway March 3, 1942. v. E. RoseNE . 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 2 A/G.4 44 4// 2go t 4OW MAAG/MAZ lEC fill, HE | 484 422 4/2 |, . f HE 408 4O6 E = t S747/OM B /WMEW7OAR M.A.AOSAWA W4-hitA77OARWEY March 3, 1942. V. E. RoseNE 2,274,638 TELAUTOGRAPH SYSTEM Filled Nov. 15, 1939 7 Sheets-Sheet 3 4O6’ 4/3 S747/OW A /WWEM7OAR M.A.AOSAWA - 394.a 77OARWEy March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM I Filled Nov. 15, 1939 7 Sheets-Sheet 4 S747/OW A WVEWTOR V.A.AOSEWE "g Ysch. A A77OARWEY March 3, 1942. V. E. RoseNe 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 5 76 A/G. 7 77 f, f 7// s L £3,79 729 9 E 74 7s Vf FL A. 4.E. — 72 E. TEEET 725 S747/OW B WWEW7OAR MAAROSAWE A77OARWEy March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM - Filed Nov. 15, 1939 7. Sheets-Sheet 6 S A//2 XTNS S.N Nims S7477OW B /W/EW7OAR V.A.AOSAWE As %4. a77OARWAY March 3, 1942. V. E. RoseNE - 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 7 s E. 7 A77OANEY Patented Mar. 3, 1942 2,274,638 UNITED STATES PATENT OFFICE TELAUToGRAPH systEM Victor E. Rosene, Jamaica, N. Y., assignor to Be Telephone Laboratories, Incorporated, New York, N.Y., a corporation of New York Application November 15, 1939, Serial No. 304,455 8 Claims (CI. 178-19) . This invention relates to Systems for trans cuits and the receiving points followed the move mission of intelligence over wires or radio cir ment of the sending point. cuits and particularly to a telegraph system in In another case, heretofore known, wherein which the movements of a stylus or writing point, the component motions varied the phase angle at a transmitting station, are recorded in fac of an oscillating potential applied to the line, Simile at a distant receiving station. the varying phase angles of the receiving signals An object of the invention is to improve trans were utilized to move a receiving pen or stylus mission in a telegraph system of this type, and to reproduce the motions of the transmitting this is accomplished by utilizing the changes in point. - . frequencies of transmitted electric current 10 According to the present invention, the move rather than the changes in intensities, for re ment of the directing, or writing, point at the producing in facsimile in a recording station the transmitting station is resolved ino two com transmitted intelligence. ponent motions which likewise vary the fre Heretofore in systems of this type, the move quencies of two signal currents being trans ment of a directing, or writing, point at the mitted over the line wire or radio circuit. These transmitting station was resolved into two com currents are varied in frequency, and are ulti ponent motions, which in one case varied the Gized to produce, or indicate, corresponding frequencies of two signal currents being trans movements of the writing point at the receiving mitted over the line circuit and in another case statiun. However, the present invention differs varied the phase angle of an alternating cur *z). from the systems heretofore known in that at rent voltage applied to the line. the transmitting station, two alternating cur In one type of system, the signal currents of rents of different frequencies are generated by varying frequencies were utilized to produce cor means of oscillators and transmitted over a wire responding movements of the directing, or writ line or radio circuit to a receiving station where ing, point at the receiving station. The two sig 5 the two currents are separated by means of fil nal frequencies, however, were preferably cut 2 ters. Each of the currents passing through a in separate concentric grooves on the same filter is then impressed on a vacuum tube mod phonographic record and the variations in these ulator circuit together with an alternating cur frequencies corresponding to the movements of rent of a distinctive frequency from a local oscil the transmitting writing point were obtained by : lator. Each of the modulator circuits is bal moving reproducers along the grooves to in anced so as to eliminate in the output the fre crease or decrease the relative speed of the rec-. quency of its local oscillator. The lower or high ord with respect to the reproducer stylus. At er side-band products of the modulator circuit the receiving station the line frequencies were outputs are introduced into special vacuum tube separated and each was modulated with a local circuits. The two special vacuum tube circuits frequency which was obtained from a record are preferably tuned to the same frequency and similar to the one at the transmitting station. respectively operate two receiving elements. On Each of the frequencies generated at... the receiv each of two rotatable shafts of the receiving ele ing station differs. normally from the correspond ments is mounted a variable air condenser which ing line frequency by a predetermined frequency 40 controls the frequency of one of the local oscil for which the receiving circuit. is balanced in lators and thereby maintains a fixed side-band. such a way that no motion of the receiving, or frequency in the output of each of the mod recording, point is produced but any slight ulator circuits. The positions of the receiving change in the line frequency due to the motion elements correspond to the frequencies of the of the transmitting point unbalances the receiv currents received from the transmitting stations. ing circuit and moves the receiving, or record - Since the position of the receiving elements is ing, point and the associated reproducers until determined by the frequency of the currents re the balanced condition was restored. By setting ceived and not by their intensity, the circuit be up the receiving circuit for a balance, when the tween the transmitting and receiving stations is difference between the line frequencies and the not required to have a linear frequency versus locally generated frequencies was small as com attenuation characteristic. The transmitting pared with the line frequencies, the changes in pen, hereinbefore referred to as the directing, line frequency corresponding to even slight or writing, point, at the transmitting station is movements of the transmitting points produced fastened to two sliding arms each of which is large unbalancing effects in the receiving cir 55 connected to a rotatable shaft. Each shaft when 2 2,274,688 rotated about its longitudinal axis operates a comprises only two stations, stations A and B, variable air condenser. The condenser settings either one of which may send to or receive from determine the frequency of the oscillators used the other over line conductors such as those for transmission. The recording pen, or Writ designated 30 and 302. Although the system ing point, or, at times, referred to hereinafter only shows transmitting apparatus at station A as an indicator, at the receiving station, is fas and receiving apparatus at station B, it is un tened to a member which slides on two arms, derstood that each station may comprise both each of which is pivoted to a shaft fixedly mount transmitting and receiving equipment. Further ed on the rotor of one of the receiving elements. more, by employing either automatic Or manually The shafts when rotated about their respective O operated switching, facsimile messages may be longitudinal axes operate variable air condensers transmitted to anyone or a plurality of stations which, in turn, vary the frequencies of the two or to two or more stations for broadcast pur local oscillators respectively to compensate for pOSes. The automatic and manually operated the unbalance in the outputs of the Special vac Switching equipments are well known in the tele uum tube circuits which outputs cause the re 15 phone art and therefore are not shown or de cording pen to take a position corresponding to Scribed herein. the position of the transmitting pen. A transmitting unit and a receiving unit may Afeature of the invention is the adaptability. be provided at each of stations A and B. The of the system to transmission over a wire line Or transmitting unit such as that designated T com radio circuit. 20 prises a table 90 (shown in Fig. 9) a transmit Another feature is the adaptability of the Sys ting pen handle 902 which when manually op tem to a telephone plant for remote control of erated through its swivel bushing 903 closes con the various devices or for the transmission of tacts 904 and brings transmitting pen or stylus alarms from an unattended repeater station to 905 into engagement with a sheet of paper (not an attended station. 25 shown) affixed to table 90. The transmitting Still another feature resides in its use for tele pen can be made to leave a record on the paper. metering purposes by making use of One trans The transmitting pen is fastened to two sliding mitting oscillator and one receiving element with arms 303 and 394 which are respectively con its associated vacuum tube circuit. W nected by means of rotatable shafts 305 and 306 In the drawings: 30 to variable air condensers 307 and 308.