Five years after she had joined her brother at Bath, Caroline made her first appearance as a public singer. She was very successful, and her friends anticipated that her well-cultivated and beautiful voice would become a means of providing her with an ample income. She, however, had so fully identified herself with her brother’s astronomical labours, that she only regarded her musical acquirements as a means of setting him free to devote himself more completely to the real object of his life. His fame as a maker of telescopes had by this time spread all over Europe, and many scientific societies, royal persons, and other celebrities, ordered telescopes of him. On these orders he was able to realise a large profit, but Caroline always grudged the time devoted to their execution. Her aim for her brother was not that he should become rich or even well-to-do, but that he should devote himself unreservedly to advance the progress of astronomical science. She was ready to live on a crust, and to give herself up to the most pinching economies and even privations, for this end. She was the keeper of her brother’s purse, and received his commands to spend therefrom anything that was necessary for herself; her thrift and self-denial may be judged from the fact that the sum thus abstracted for her own personal wants seldom amounted to more than £7 or £8 a year. The next great change in the life of the brother and sister took place in 1782, when William Herschel left Bath and was appointed Astronomer-Royal by George the Third. His salary of only £200 a year involved a great loss of income, but this, in his eyes, was a small matter in comparison with the advantage of having his time entirely free to give up to his favourite studies. They bade farewell to Bath, and settled first at Datchet, shortly after, however, removing to Slough. Caroline had dismal visions of bankruptcy, but William was in the highest spirits, and declared that they would live on eggs and bacon, “which would cost nothing to speak of, now that they were really in the country.”