1:881.1 The Photophone . 2 *3 
in the focus of a silvered refledtor of parabolic contour, and 
the photophone receiver is complete. 
Fig;. 3 represents this refledtor, c c, with the cell, s, m the 
focus, and the requisite attachments cf battery and tele- 
phones. The transmitting apparatus consists of a mirror 
m, reflecting a beam of sunlight through c a lens, and (it 
^ Y — xjp- 
if/ 
E 
C* 1 
q w 
J 
Fig. — Theoretical Diagram of the Articulating Photophone. 
Fig. 4.— The Articulating Photophone. The Transmitter. 
