| Show f. f u Talking motion A A SH- SH f Pictures a Reality I Talking motion pictures s In which the simultaneous timing tuning of action artion f t and sound is all nIl times assured have iC been announced anti and demonstrated J by the G Electric company The process the result of several se years ears of or experimenting in the Gen c era cral I Engineering laboratory of th the T. T company means but slight In standard motion picture projectors projectors tors tOftS since it involves only the addition addi add tion lion of a n sound reproducing attachment attachment attachment at at- and a 3 loud speaker speake suitable suitable suitable suit suit- able for Cor auditorium use rise Both the picture and the sound are re rc corded on the same S1 film One of the demonstrations has fe- fe been with music to accompany tune tuie films the music being by fc b full concert orchestra Develop Development Development Development ment of this field requires nc change in the technique of making tie tec original film After the inal Ina picture film has been math madi r. r and titled the accompanying music mush Is pla played ed b by a concert orchestra al and d is recorded on a film The picture and sound records are then printed on one film file in the propel proper time relation Another type lype has b been the show showing showing ing lug of singers and In Instrumentalist while while- the they are presen presenting ing programs program Th Thus us when an orchestra is on the screen it Is possible to foLlow fol low the playing of each musician and see his actions on the screen and hear him Even cymbal among llong the most difficult to reproduce reproduce reproduce duce faithfully sound faithfully sound like cym Cm bals gals Similar demonstrations demonstration t. t have been made with vocal and In Instrumental instrumental Iii soloists with string ani am ane i M w vocal quartets and with 0 ers To the casual observer the talk talking talking ing lag film does not differ from the usual motion picture positive It is h o o. o standard width but along the left margin there is a strip a smal fraction of an inch wide on Is a a. series of horizontal light ant ane talk bands and lines of varying widths and rind intensities It is this thi series of bands and lines which produces produces produces pro pro- duces the sound The film is passed i through the a at t constant I speed and as these light and dark bands pass rapidly before a Un tiny slit in an optical system the amount of light is varied The amount of light ib is received by a photoelectric cell cell cell- the tile electric eye eye eye which is extremely extreme extreme- ly sensitive to any change in the amount of light striking It IL The ote i-ote light received the more current current cur cur- rent it will permit to pass its circuit This current is lied hed and changed from electrical to audible energy by an amplifier and speaker I FIELDS OF APPLICATION At this early earh date it is not possible possible poss pOSS- ible to define the fields in which this new type of talking motion pic pictures tu tures res will be o of use One of the list however will be in supplying a full orchestra accompaniment for pictures The community picture accustomed to having a n piano or piano and violin will beable bo be able to have the same music as the metropolitan oli n theatre I I Another field is offered b by the news new reels reds Not only will It j be be possible to show important per- per ions but they can cnn talk to the aud aud- i fence lence and visiting notables can ex- ex end their greetings I eX-I It has not been possible for I amed tamed musicians and orchestras to in small communities The i motion pictures will permit j I hem to be both seen and heard I the country Educationally there are also nany ways in which the i ne new s1 aP- aP l ap-l I ap-I aratus will be of service Many schools and colleges are already quipped with motion picture projectors projectors pro pro- as an aid in class room I work vork and the new film will ill be found Cound of even more assistance In h he case caRp of from abroad I t will be possible to record their their I I and demonstrations simu I and to give gio their lec- lec ures tires the widest possible use uso by of the film to colleges nd universities throw throughout the Similarly it will be to have an au authority hority on he subject give a ion to ac- ac an any educational film for forIse forise ise use in schools the speech pointing ut rut the Important features rs features of the picture simultaneously with their on the screen These are but a a. few of or orthe the possible possible poss- poss ible ble fields in which the new talking notion pictures will find Und I Ion Jon The list can and an and will be expanded THE APPARATUS Outstanding among the features of the new apparatus are arc that both he picture and sound records are aren are on In n the same standard motion pic- pic with an attach attachment men menor or the sound reproducer Is used I since ince the picture and sound records II tre ire printed side by side on the film It t necessarily follows that the two I must be properly timed or synch- synch at all times times times-it it is not poss- poss possible possible ible ble for the picture to break and I he lie sound to continue or for the Sound to stop and the picture to continue I There are three principal elements elements elements ele ele- ments In the apparatus including t 1 standard motion picture or with a sound reproducing at- at all driven by synchronous ous motors The pictures themselves themselves them them- selves are made in the usual way wayon wayon Ion on standard film In recording the sounds a micro phone phone hone or sound collector of any de- de ired type is employed together amplifiers The actuates a tiny vibrating mirror which records the sound on he film as light and d dark rk bands the he light ht from a small incandescent amp being reflected by the mirror through a tiny slit in the op optical tica I system in front of the film film The higher the pitch of note the higher it ts frequency frequency and and the greater the of vibrations of the mirror or rr which fa faithfully reproduces each sound vibration as a mark on the film fUm I IThe The sound record can be made maden n different ways Bot Both the picture picture picure pic- pic ture ure and sound can be simultaneously simultaneously simultaneously recorded on the same film by mounting the two rec recording elements elements elements ele ele- ele- ele ments as a unit with the sound recorder recorder reorder re re- re- re corder order uppermost The two reorders re orders can also be mounted separately separately separately separ separ- and the sound and picture film negatives made as individual units such an arrangement being I preferable when the pictures are being made in studios and when he the camera is being shifted con con- Again as in the case of I accompanying music the picture film ilm can be entirely entire finished and titled the record of the music music then being made on a separate film and the he two combined on the finished positive THE PROJECTOR The Tho sound reproducing atta attachment attachment attach attach- h- h ment which is connected to the standard motion picture projector consists of a photoelectric cell behind behind be- be hind the film and anda a sm small ll electric lamp amp with suitable optical arrangement arrangement arrange arrange- ment in front of at the film As the film passes a small slit silt similar to the he one used in making the Ithe sound record a varying amount of light is admitted to the photoelectric cell the amount of light t depending on the he photographic density on the sound track The result Is that a avery avery very cry minute and varying current an exact replica of the sound wave Is 18 produced This tiny current is amplified and led to a loud speaker which reproduces the sound in different different dif dlf dif dif- ferent volume to fill fm th the auditor- auditor An Any suitable loud speaker speake may be employed The one for tor large auditoriums auditoriums aud I which has been used Inthe Inthe in inthe the demonstrations has been a Hewlett loud speaker chosen be cause of its ability to give the necessary volume sand and bec because use of the the quality of tone reproduction of which the de device i e Is capable I. 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