ILLUSTRATIONS 



MATERIAL FOR MAKING PAPER Frontispiece 



SAMUEL F. B. MORSE Facing p. 18 



MECHANISMS INVOLVED IN WIRELESS TELEGRAPHY . . " 60 



DR. GRAHAM BELL IN NEW YORK COMMUNICATING FOR 



THE FIRST TIME WITH CHICAGO BY TELEPHONE . " 74 



MESSAGES BY WIRELESS TELEGRAPH AND WIRELESS 



TELEPHONE " 88 



AN EARLY TYPE OF PRINTING-PRESS " 122 



A VIEW IN THE PRESS-ROOM OF HARPER & BROS., NEW 



YORK CITY " 138 



MANUFACTURE OF PAPER " 170 



PULP-GRINDING MACHINERY " 174 



THE FLYING MACHINE OF MR. GLEN H. CURTIS A RE- 

 MARKABLE EXAMPLE OF INSTANTANEOUS PHOTOG- 

 RAPHY " 232 



[vii] 



