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