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