Thank you for reading this post, don't forget to subscribe!
1973, Digital Displays: “Electronic numbers are becoming a familiar sight on consumer items such as pocket calculators, digital clocks and electronic watches. Three types of arrays have been developed. The simplest is the seven-stroke array (top), basically a rectangle with a horizontal bar. The four-by-seven dot array (middle) also is a rectangle with a horizontal bar. The five-by-seven array (bottom) has 35 dots; it can also generate all the letters of the alphabet.” Credit: Scientific American, Vol. 228, No.6; June 1973
This article was originally published with the title “50, 100 & 150 Years Ago” in Scientific American 328, 6, 87 (June 2023)
doi:10.1038/scientificamerican0623-87
ABOUT THE AUTHOR(S)
Mark Fischetti is a senior editor at Scientific American. He covers all aspects of sustainability. Follow him on Twitter @markfischetti Credit: Nick Higgins
