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