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