At the time this article appeared, the British monarch was Queen Victoria, who had ascended to the throne in 1837.
The Electrician (London), May 26, 1899, page 144:
The Queen and the Electrophone.--Her Majesty heard the electrophone for the first time on Wednesday, when she listened at Windsor Castle to the boys from all the naval and military schools and the Duke of York's school singing "God Save the Queen" at Her Majesty's Theatre, in London. Afterwards the Queen and her guests had the opportunity of listening to the concert at St. James's Hall.