TIME 



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At one of the scientific soirees at the Sorbonne, 

 during a conference on animal movement,* one of our 

 associates, a celebrated organist, kindly played some 

 pieces of music which recorded themselves before the 

 eyes of the audience, and of which we here give two 

 examples (Fig. 10, A and B). Every one who is 



Fig. 10.— Record of two airs played on the keyboard of a harmonium. 



accustomed to read ordinary music will easily decipher 

 these examples; they only differ from the ordinary 

 score by the way in which the duration of the note 

 is expressed. Instead of the conventional method of 

 expressing the duration of different sounds by minims, 

 crotchets, and quavers, and the duration of silence 

 by rests and crotchet-rests, the graphic method conveys 

 * See La Nature, 5th October, 1878. 

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