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