He could think of nothing

People had long known that lightning and electricity were the same.

Signals had been made with electricity.

But the thought which came to Mr. Morse had never entered the mind
of man before.

He could think of nothing but a telegraph.

He thought night and day.

He seemed to see the end from the beginning.

As he sat upon the deck of the ship after dinner, he drew out a
little note book.

He began his plan in this little book.