The laboratory notebooks these tables refer to
experiments with record blanks and the assembly and testing the diaphragms
used the cylinder and disc phonographs. EDIS collection.
Object and Location Evidence Recommendation
South Wall:
CUPBOARDS with glass
doors (southwest section of
wall)
Figure 20. EDIS collection. Reproduce.
LAB TABLE center of
room)
Figure 20.
WIRES and BULBS (hanging
from ceiling)
Figure 20. The mica samples were used make
up the thin diaphragm that vibrated with the movement sound waves. Use existing cupboards. According photographic evidence, the balance room appears to
be the place where Edison did much his experimenting. Acquire.
PAINT SAMPLES metal
strips (hanging over counter)
Figures and 25. This
room also contained the precise balances used the measurement chemicals.
CONTAINER, tin (on table) Figure 20. mounting his samples this fashion, Edison could
test for fading well monitor the adhesion the paint onto the surface the
strips. EDIS collection.
BEAKERS, (on table) Figure 20.
201
.
GLASS BOTTLES, large
(on table)
Figure 20. Acquire. Use EDIS 3333e.
CHAIR Figure 20. EDIS collection acquire.
West Wall:
COUNTER (against west
wall)
Figure 26.
Experimental BATTERY
STAND (on table)
Figure 20.Balance Room.
The items shown hanging over the west wall figure are assumed paint
samples metal strips. EDIS collection acquire. Use EDIS 21385.
SIDE TABLE Figure 20. Figure shows
electrolytic equipment used storage battery work the main table, and on
adjoining tables are the microscopes used examine the minute grooves disc
and cylinder records
