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