![Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical](https://c8.alamy.com/comp/2HER5PP/thomas-edisons-electric-pen-with-its-wet-cell-battery-the-pen-was-designed-to-duplicate-documents-and-went-on-sale-in-late-1875-but-because-of-the-high-maintenance-battery-its-commerical-life-was-short-and-it-was-soon-replaced-by-more-efficient-technologies-2HER5PP.jpg)
Thomas Edison's electric pen with its wet cell battery. The pen was designed to duplicate documents and went on sale in late 1875 but because of the high maintenance battery its commerical
![TIL Thomas Edison, whose many inventions included a tattooing machine, had a five dots pattern tattooed on his forearm. : r/todayilearned TIL Thomas Edison, whose many inventions included a tattooing machine, had a five dots pattern tattooed on his forearm. : r/todayilearned](https://external-preview.redd.it/CYR5JRiEZiEvyaFszVNItVKTWp33mrXxyYR-KXertE8.jpg?auto=webp&s=944749f40bc46e017914c0255363d4a193385b4e)
TIL Thomas Edison, whose many inventions included a tattooing machine, had a five dots pattern tattooed on his forearm. : r/todayilearned
![An Extremely Useful Invention': Edison's electric pen and the unravelling of old and new media - Peter Unwin, 2019 An Extremely Useful Invention': Edison's electric pen and the unravelling of old and new media - Peter Unwin, 2019](https://journals.sagepub.com/cms/10.1177/1354856519846790/asset/images/large/10.1177_1354856519846790-fig4.jpeg)