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