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