The vacuum pump room would have contained one more vacuum pumps to
evacuate air from the incandescent bulbs.
471 Notebooks N-87-12-10. They noted: "The
tools and appliances are kept intact, for Edison calls occasionally for their use in
some his later experiments, and there suspicion among the laboratory staff
that some day may resume work incandescent lamps.472
Building Second Floor Vacuum Pump Room and Glass Blower’s Room,
Period II: 1901-1914
The vacuum pump room and glass blower’s rooms were still the laboratory
when Dyer and Martin were writing their book before 1910.1, N-88-02-02, and N-90-11-07; see also Dickson and Dickson, The Life and
Inventions Thomas Alva Edison, 295.470
169 Shop Order 447 (1890). shop order for 1890 describes work room for experiments on
bulbs,469 and John Dorr stated that helped Fessenden develop filaments an
upstairs room. Dickson reported that the vacuum
pump room was devoted experimental bulbs and several notebooks from this
period testify the great amount experimental work that was done new
types incandescent bulbs. Dickson described
the adjacent glass-blowing room "devoted the construction the
experimental lamps. Presumably there would have been stocks bulbs on
shelves and experimental light bulbs strewn around this room.
410 Edison Pioneers Records, Box 21.
472 Several glass blower’s jets have been found building They are arranged attached a
tabletop."471 would have been equipped with glass blower’s
jets."473 Dyer and
Martin also mention that these rooms are historic value "by reason the
strenuous work done incandescent lamps and X-ray tubes within their walls.
Building Second Floor Vacuum Pump Room and Glass Blower’s Room,
Period 1887-1900
It likely that the vacuum pump room and glass blower’s rooms were located on
this floor."
140
. 1981, one them was the opposite side,
but migrated back during the ensuing decade.
473 Dyer, Martin, and Meadowcroft, Edison: His Life and Inventions, 648.center aisle the 1939 photos
