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