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Updated: May 18, 2025
The Mundurucú warrior, when he had killed an enemy, cut off his head with a broad bamboo knife and proceeded to preserve it thus: First he soaked it for a time in some non-oxidizable vegetable oil; then he extracted the bone and the bulk of the muscles somewhat as a bird-stuffer extracts the body from the skin. He then filled up the cavity with hot pebbles and hung the preparation up to dry.
I next tried the effect of electrolytic action when iron salts were present, but did not think of using iron electrodes until after trying aluminum. I found that the action of non-oxidizable electrodes was most efficacious after the temperature of the fluid acted upon rose 4° or 5°; but the cost of working made it impossible on a large scale.
Another improvement that followed along the lines adopted by Edison for the commercial development of the phonograph was making the recording and reproducing styluses of sapphire, an extremely hard, non-oxidizable jewel, so that those tiny instruments would always retain their true form and effectively resist wear.
My first electrolytical experiments were conducted with non-oxidizable plates of platinum and carbon, but the cost of the first and the impossibility of obtaining carbon plates that would stand long-continued action of nascent chlorine and oxygen made it desirable that some modification should be tried.
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