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