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

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