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

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