..................................... 140
Building Second Floor Vacuum Pump Room and Glass
Blower’s Room, Period II: 1901-1914.............. 140
Building Second Floor Experimental Rooms, Period 1887-
1900 and Period II: 1901-1914............................. 165
Building General ....................................... 151
Building Third Floor, Music Room .......... 154
Building .... 165
Engineering Department .....Building Precision Machine Shop, Period II: 1901-1914 ......... 137
Building Precision Machine Shop, Period III: 1915-1931 .................................................................................................................................................... 153
Building Period II: 1901-1914............................... 144
Building Third Floor, Lamp Test Room ..................................................................... 141
Building Room .... 151
Albert Petit’s experimental room ............................................ 144
Building Third Floor, Recording Studio ...................... 144
Building Third Floor, Period II: 1901-1914 and PeriodIII:
1915-1931 ........ 152
Fred Ott’s experimental room........... 166
vi
.................................. 165
Historical Research Department..................................................................... ............................................................. 161
Building Chemical Store Room........................................................................... 152
Building Powerhouse, Period 1887-1900 ......................................................................................................... 139
Building Second Floor Vacuum Pump Room and Glass
Blower’s Room, Period 1887-1900 ..................................... 141
Building X-Ray Room....................................................................................................................................................................................................................... 152
Photographic department.............................................. 146
Building Third Floor, Central Open Area............................................. 144
Building Third Floor, Storage Battery Test Department..................................................................................... 146
Building Third Floor, Educational Film Studio....... 141
Building Second Floor Experimental Rooms, Period III:
1915-1931 ............................................................................................................... 142
Building Drafting Room, Period 1887-1900 and Period II:
1901-1914 ......................... 164
Building Machine Shops. 165
Ediphone Development.............................................. 153
THE POST-EDISON YEARS: Period IV: 1932-1962 ........................................... 143
Building Drafting Room, Period III: 1915-1931 ................................................... 160
Building ............. 154
Historical Occupancy and Furnishings..................... 151
Building Third Floor, Offices (South Side) ....................................... 162
Building Pattern Shop................................ 162
Building ............ 163
Building Library .................................... 143
Building Third Floor, Period 1887-1900 ........
