At that time there was no electric telegraph to India.

This single line working was facilitated by the installation of electric telegraph.

Battle orders were flashed by electric telegraph to places thousands of miles away.

His interest in the subject led him to make electrical inventions including an improved electric telegraph.

He installed electric telegraph along the banks of the canal.

They will fire only when your electric telegraph is activated.

In the 1840s he used his leisure time to experiment with both visual and electric telegraphs.

Many contemporaries predicted the failure of electric telegraphs because "they are so easy to cut."

He also worked on the development of the electric telegraph.

He also believed that the ancient Maya understood the use of the electric telegraph.