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