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