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

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