Object and Location Evidence Recommendation
Table 2
LAB TABLE (in place) Figure 29. Use EDIS 14330 through
14335. The result was a
perfect negative impression the recording groove, called matrix. the
production process thin layer graphite was brushed onto the wax master.
VACUUM PUMP (on table) Figure 29. This equipment for disc records was successor the method
of gold plating cylinder masters that had been successfully developed the
laboratory from 1888-1903.
GRAPHITE (in six glass jars) Used plating. Use EDIS 2077. The master
was first copper plated, and then nickel plated top this thin layer form a
durable surface.Table Electroplating Records. Use E-159-5.
Acquire. Use EDIS 376.
ELECTROPLATING
DEVICE (on table)
Figure 29.
208
.
BRUSHES, (on table) Used clean wax from
copper surface.
Al Wurth was the electroplating expert the laboratory and would have
supervised this work. Use EDIS 23181 (copper
plated mold) and EDIS 24845
(copper master mold).
EDIS collection reproduce.
WAX MASTER (in
electroplating device)
Complements artifact. Attach vacuum pump.
TOOTHBRUSHES, Used plating. The electroplating equipment shown this
table represents the method Edison devised make numerous duplicates of
master recordings. Use EDIS 14425 through
14428.
Both these methods gave the surface the disc electroconductive surface. This was
used the record press make duplicates.
The plating was done hard rubber baths with anodes inside them.
MOLDS, one copper-plated
and one copper-master (next
to wax master)
Complements artifact. The wax was removed and the surface cleaned.
KNIFE, sharp (on table) Used trim "flash," pieces
of material protruding over
the edges the mold. The cylinder disc was placed inside vacuum and
small particles gold "spluttered" while the disc cylinder revolved
