ON THE PHONOGRAPH. 785 



Note. — Figs. 6-18 are from microphotographs of curves similar (though varying in amplitude) to 

 those in figs. 18 and 19 in Plate I., and in Figs. 1, 2, 3, and 4 of this plate. They are magnified 

 from 5-10 diameters. Only short portions of the curves are given to illustrate the great variety 

 in form. 



Fig. 6. Tuning fork, 32 vibs. p. sec. 



Fig. 7. Cornet. 



Fig. 8. Old English coach horn. 



Fig. 9. Bassoon. 



Fig. 10. Bassoon. 



Fig. 11. Cornet. 



Fig. 12. Military band. 



Fig. 13. Military band. 



Fig. 14. Flute. 



Fig. 15. Piccolo. 



Fig. 16. Piccolo. 



Fig. 17. Piccolo. 



Fig. 18. Coach horn. 



Note. — The curves shown in Figs. 19, 20, 21, and 22 were taken with a syphon-recorder, to be 

 described in a subsequent communication. It will be seen that they are a great advance on the 

 curves obtained by the older methods. One inch of these tracings represent j^ of a second. By 

 counting the number of waves in this distance, the pitch can be determined. 



Cornet. 

 Piccolo. 

 Curves of a noise. From the record of the noises in a boiler-maker's shop. Note the irregularities 



of the curves. 

 Song by a tenor voice. Note the gradation from one pitch to another. At the right and left ends 



of the tracing, the voice was sounding a note a little above the middle C, and in the middle 



the pitch was about an octave lower. 



Fig. 



19. 



Fig. 



20. 



Fig. 



21. 



Fig. 



22. 



VOL. XXXVIII. PART IV. (NO. 22). 5 R 



