William, Kate send tweet - via Morse code

The Duke and Duchess of Cambridge brought old technology up to date when they used a Morse code telegraph machine to send their first joint tweet.

William and Kate's message was transmitted to the world during a visit to a Canadian museum telling the story of the Yukon - famed as the home of the Klondike gold rush.

Radio operator Doug Bell tapped out the Cambridges' tweet when their tour of the visitor attraction in Whitehorse - known as the Wilderness City - brought them to the settlement's old telegraph office, now a preserved exhibit.

The royal couple both held the lever down to send the tweet, posted under the Twitter account Telegraph to Tweet, which said: "The Duke and Duchess of Cambridge, September 2016, Whitehorse Yukon."

The telegraph machine operated by Bell, a former commissioner of Yukon, was wired up to a micro control unit which converted the electrical signal into letters and was connected to a PC.

William and Kate, who wore a red Carolina Herrera coat, looked fascinated as the 90-year-old tapped out the message with dots and dashes.