EDISON LABORATORY Edison National Historic Site West Orange, New Jersey Volume 1

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