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