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