3A 3B 
J. W. GILTAY. „The effect of the induction coil in telephonic apparatus.” (IL) 
Microph. Battery. ff 
Fig. 9. 
a 
i - | 
Bellati with thick wire. 
Bellatc. 
i Monet; 
3A | 
35 
Battery (oS) ; ! 
Microphone : 
ie ot 
Fig. 18. 
Fig. 12. 
Bellati 
Bellati | 
BN A B WWM 4 
Fig. 14. 
pe aes oe eet Flee 
ellati t 
| 3A 3B 
Î 
Proceedings Royal Acad. Amsterdam. Vol. UV. 
ene 
