visitor this upper floor the
laboratory building cannot but impressed with consciousness the incessant
efforts that are being made improve the reproducing qualities the phonograph
as hears from all sides the sounds vocal and instrumental music constantly
varying volume and timbre, due changes the experimental devices under
trial.. This floor was conveniently divided two central partitions into
three broad areas: storage battery testing area, central open area, and music
room area.In the front end the building, and extending
over the library, large room intended originally and used for time the
phonograph music-hall for record-making, but now used only experimental-
room for phonograph work, the growth the industry has necessitated very
much larger and more central place where records can made commercial
scale.490
490 Dyer, Martin, and Meadowcroft, Edison: His Life and Inventions, 651. Miller’s and Petits
[sic] rooms. fact, this hallway, with its conglomerate contents, may
well considered scientific attic.floorboards were completely covered some time between 1904 and 1910.
491 Notebook N-10-05-12,
Additional power for the third floor was also required:
A new power line wires 240 120 volts) was run from the Phonograph
Works, and connected top floor Laboratory April 17, 1910. Miller... Only one
small room the west end the floor retains the old floorboards, which are
broader than the new ones and run east west rather than north south as
they now.
Dyer and Martin described the third floor 1910:
Passing now the top floor the visitor finds himself the head broad hall
running almost the entire length the building, and lined mostly with glass-
fronted cabinets containing multitude experimental incandescent lamps and an
immense variety models phonographs, motors, telegraph and telephone
apparatus, meters, and host other inventions upon which Edison’s energies
have one time and another been bent. line experimental rooms (containing the photographic room)
stretched along the Lakeside Avenue side. Even the experimental work imposes slight burden it. wattmeter is
connected each side the system, the one the right (South) recording power
used Room #14 exclusively except for few lights Anderson’s room; the one to
the left recording power used our small cell room and H.F.491
145
. Here also are other cabinets containing
old papers and records, while further along the wall are piled boxes historical
models and instruments. each side of
the hallway above mentioned, rooms are partitioned off and used for experimental
work various kinds, mostly phonographic, although this floor are also located
the storage-battery testing-room, chemical and physical room and Edison’s private
office, where all his personal correspondence and business affairs are conducted by
his personal secretary, Mr
