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