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