Caroline was now installed as an assistant astronomer, and was given a telescope, which she calls a “seven-foot Newtonian Sweeper”; and she was instructed, whenever she had an evening not in attendance on her brother, to “sweep for comets”; but her principal business appears, at this time, to have been waiting on her brother, and writing down the results of his observations; they worked quite as hard as they had done at Bath. They laboured at the manufacture of instruments all day, and at the observation of the heavens all night. No severity of weather, if the sky was clear, ever kept them from their posts. The ink often froze with which Caroline was writing down the results of her brother’s observations. It has been well said that if it had not been for occasional cloudy nights, they must have died of overwork. The apparatus for erecting the great forty-foot telescope, and the iron and woodwork for its various motions, were all designed by William Herschel, and fixed under his immediate direction. His sister, in her _Recollections_, wrote: “I have seen him stretched many an hour in the burning sun across the top beam, whilst the iron-work for the various motions was being fixed.” The penurious salary granted to William Herschel was supplemented by special grants for the removal and the erection of all this machinery; and in 1787 Caroline’s services to her brother were publicly recognised by her receiving the appointment of assistant to her brother at a salary of £50 a year. She was at all times grateful to members of the royal family for acts of kindness shown by them to her brother and herself; but it is evident that she felt that, so far as money was concerned, she had not much cause for gratitude to the royal bounty. She points out that at the time when Parliament was granting George III. the sum of £80,000 a year for encouraging science, £200 was considered a sufficient salary for the first astronomer of the day; and yet money could flow liberally enough in some directions, for £30,000 was at that time being spent on the altar-piece of St. George’s Chapel, Windsor. Even Caroline’s little salary of £50 a year was not regularly paid. It was a trial to her again to become a pensioner on her brother’s purse, and it was not till nine quarters of her official salary remained unpaid, that she reluctantly applied to him for help. No wonder that in reading, after her brother’s death, an account of his life and its achievements, she remarks, “The favours of monarchs ought to have been mentioned, _but once would have been enough_.”