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