2019-08-16 19:23:48 | 人氣(19) | 回應(0) | 上一篇 | 下一篇
推薦 0 收藏 0 轉貼0 訂閱站台

A Short History Of The Air

The electromagnet was discovered in 18-25. If you think anything at all, you will possibly require to explore about asea company. This development opened the doors to world wide communication! Five years later, Joseph Henry successfully given an electric current via cable which was extended over a distance and which induced an electromagnet to induce the sounding of a bell. Hence, the electric telegraph was born. Among the most familiar names associated with the telegraph is Samuel Morse who's most significant for the number of spots (quick sound) and dashes (more sustained sound) that was used to transmit messages by alphabet code (ergo known as Morse Code). Telegraph became the sole method of rapid cross country communication until 1877 and the invention of the phone.

台長: crunchbasecom
人氣(19) | 回應(0)| 推薦 (0)| 收藏 (0)| 轉寄
全站分類: 電影賞析(電影情報、觀後感、影評)

是 (若未登入"個人新聞台帳號"則看不到回覆唷!)
* 請輸入識別碼:
(有*為必填)
TOP
詳全文