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   Niki Tonsky (nikitonsky@mastodon.online)'s status on Tuesday, 02-Jun-2026 08:27:02 JST Niki Tonsky

   in reply to

   • Mark Dominus

   @mjd damn I like that!

   • Embed this notice
     Mark Dominus (mjd@mathstodon.xyz)'s status on Tuesday, 02-Jun-2026 08:27:03 JST Mark Dominus

     Today I learned that the earliest designs for #trafficLights used a single bulb for each phase. The same bulb shone through a green lens on the main street and, at the same time, through a red lens on the cross street.

     Source: https://www.kbrhorse.net/signals/history06.html