It was known by calculation and experiment that the velocity of electricity was approximately 186,000 miles per second; that is, equal to the velocity of light, which in itself suggests the idea of a relationship between -electricity and "light."
ومعروف أيضا بالحساب والتجربة أن سرعة الكهرباء هي 186,000 ميل\الثانية وهذا يعادل سرعة الضوء، وهو بحد ذاته يعطي فكرة وجود علاقة بين الكهرباء و"الضوء".