1912] on the Ganmonf Speaking Cinematograph Films. 4X5 



Experience has shown that the best results are obtained by first 

 setting in action the dynamos and the Phonograph. The Cinemato- 

 graph is not engaged until a given moment. This can be arranged 

 by placing a clutch between the Cinematograph and its motor. 



The automatic engagement apparatus is controlled by a lever 

 connected with the armature of an electro-magnet, which is actuated 

 at a given moment which corresponds with a definitely determined 

 position of the needle in one of the grooves of the disc of the phono- 

 graph, which is of the gramophone type. 



The next figure (3) shows the Phonograph of a disc pattern, which 

 consists of a turn-table or circular plate moving on a vertical axis, 

 controlled by an ingenious arrangement of cog-wheels at the end of 

 the axle of the corresponding dynamo. It should also be noted with 



Relation of Phonogkaph to the Actors in a Set Scene. 



regard to the recording disc corresponding to that of a Gramophone, 

 that it is a sinusoid which has the same depth throughout. In the 

 Edison method it is a groove of varying depth. 



There are two contacts by means of which the current can be 

 switched on through the engaging arrangement already mentioned. 



The turn-table (Fig. 4) is provided on its under surface with a 

 metal ring interrupted in its continuity, on which both contacts 

 pass. 



The upper surface of the turn-table (Fig. 5) carries a projecting 

 finger, which serves to fix the disc of the Phonograph in a position 

 perfectly in relation with the two contacts already mentioned. 



If, for example, by any chance there is a discord however small, 



2 K 2 



