من اخترع أول إشارة ضوئية؟

24 ديسمبر 2012

اختراع أول إشارة ضوئية؟

تم اختراعها وتركيبها في لندن بالقرب من مجلس العموم البريطاني عام 1868م على يد المخترع جون نايت وكانت تدار بشكل يدوي.

وفي عام 1910 تم تركيب أول اشارة اتوماتيكية في مدينة شيكاغو في الولايات المتحدة الأمريكية.

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