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