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