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