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

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