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Skywriting font for mac 201611/10/2023 ![]() What made this device so fast? It was the Charactron Tube which we covered back in 2017. Charactron Tube Diagram (US Patent 2735956) While this printing speed was certainly impressive, the ability to plot entire graphs and figures in just fractions of a second was no doubt well appreciated by the scientists at Dahlgren. But despite this wait time, the printing speed was much faster than line printers of the day: 7000 lines per minute vs 150. Since they used film, they required chemical processing to become photos, slides, or microfilm. Perhaps you’ve heard stories of programmers waiting impatiently for printouts from mainframe operators? Well you would have waited even longer for your optical plots. SC4020 Computer Recorder Information Manual
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