Question:
James Watt  (30 January 1736 (19 January 1736 OS) - 25 August 1819) was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1781, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. While working as an instrument maker at the University of Glasgow, Watt became interested in the technology of steam engines. He realised that contemporary engine designs wasted a great deal of energy by repeatedly cooling and reheating the cylinder. Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines.
In 1776, the first engines were installed and working in commercial enterprises. These first engines were used to power pumps and produced only reciprocating motion to move the pump rods at the bottom of the shaft. The design was commercially successful, and for the next five years Watt was very busy installing more engines, mostly in Cornwall for pumping water out of mines.  These early engines were not manufactured by Boulton and Watt, but were made by others according to drawings made by Watt, who served in the role of consulting engineer. The erection of the engine and its shakedown was supervised by Watt, at first, and then by men in the firm's employ. These were large machines. The first, for example, had a cylinder with a diameter of some 50 inches and an overall height of about 24 feet, and required the construction of a dedicated building to house it. Boulton and Watt charged an annual payment, equal to one third of the value of the coal saved in comparison to a Newcomen engine performing the same work.  The field of application for the invention was greatly widened when Boulton urged Watt to convert the reciprocating motion of the piston to produce rotational power for grinding, weaving and milling. Although a crank seemed the obvious solution to the conversion Watt and Boulton were stymied by a patent for this, whose holder, James Pickard, and associates proposed to cross-license the external condenser. Watt adamantly opposed this and they circumvented the patent by their sun and planet gear in 1781.  Over the next six years, he made a number of other improvements and modifications to the steam engine. A double acting engine, in which the steam acted alternately on the two sides of the piston was one. He described methods for working the steam "expansively" (i.e., using steam at pressures well above atmospheric). A compound engine, which connected two or more engines was described. Two more patents were granted for these in 1781 and 1782. Numerous other improvements that made for easier manufacture and installation were continually implemented. One of these included the use of the steam indicator which produced an informative plot of the pressure in the cylinder against its volume, which he kept as a trade secret. Another important invention, one which Watt was most proud of, was the parallel motion which was essential in double-acting engines as it produced the straight line motion required for the cylinder rod and pump, from the connected rocking beam, whose end moves in a circular arc. This was patented in 1784. A throttle valve to control the power of the engine, and a centrifugal governor, patented in 1788, to keep it from "running away" were very important. These improvements taken together produced an engine which was up to five times as efficient in its use of fuel as the Newcomen engine.  Because of the danger of exploding boilers, which were in a very primitive stage of development, and the ongoing issues with leaks, Watt restricted his use of high pressure steam - all of his engines used steam at near atmospheric pressure.
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What was the first type of engine he worked on?

Answer:
In 1776, the first engines were installed and working in commercial enterprises.


Question:
Alfred Cellier (1 December 1844 - 28 December 1891) was an English composer, orchestrator and conductor. In addition to conducting and music directing the original productions of several of the most famous Gilbert and Sullivan works and writing the overtures to some of them, Cellier conducted at many theatres in London, New York and on tour in Britain, America and Australia. He composed over a dozen operas and other works for the theatre, as well as for orchestra, but his 1886 comic opera, Dorothy, was by far his most successful work. It became the longest-running piece of musical theatre in the nineteenth century.
In 1885, Cellier composed a song, "There once was a time, my darling", for a piece produced by George Edwardes, Little Jack Sheppard (1885). Meanwhile he had composed what would become his greatest success, the comic opera Dorothy, with a libretto by B. C. Stephenson. To create the score, Cellier repurposed some of his music from his 1876 failure, Nell Gwynne, which had, nevertheless, received praise for its music. Dorothy had been announced for production at the Royalty Theatre in 1884, but ultimately Edwardes mounted it at his Gaiety Theatre on 25 September 1886. Cellier was in Australia from February 1886 to February 1887, conducting The Mikado and other Gilbert and Sullivan operas for the J. C. Williamson organization and was absent from London during the productions of The Carp, at the Savoy, and Dorothy. Neither the music nor the libretto of Dorothy initially attracted critical praise. The Times wrote, "Gentility reigns supreme, and with it unfortunately also a good deal of the refined feebleness and the ineptitude which are the defects of that quality." Stephenson rewrote the lyrics of one of Cellier's old songs, "Old Dreams" as "Queen of My Heart"; this helped the work to find success after it transferred in December to the Prince of Wales Theatre. The following year H. J. Leslie took over the production from Edwardes and introduced new stars, including Marie Tempest. Dorothy became an even greater success at the box office and transferred in December 1888 to the Lyric Theatre, built using the profits from the production, where it ran into 1889. Its initial run of a total of 931 performances was the longest of any piece of musical theatre up to that time, longer than even The Mikado, a fact that caused consternation to Cellier's friend Arthur Sullivan. Some critics reconsidered their earlier condemnation, the work became regarded as a classic Victorian piece, and the initially despised plot was traced seriously back to the Restoration playwrights David Garrick and Aphra Behn, and to Oliver Goldsmith and even Shakespeare. Its success led to revivals of some of Cellier's earlier works.  Cellier returned to Australia in 1888 to conduct Dorothy and made a final brief visit there for health reasons in early 1891, together with Stephenson. His last comic operas, Doris (1889, with Stephenson) and The Mountebanks (with Gilbert, produced in January 1892, a few days after the composer's death), were both modestly successful. Also after Cellier's death, Rutland Barrington used some of his music in his 1902 adaptation of Water Babies. Often in ill health throughout his life, Cellier was unable to finish The Mountebanks, and Ivan Caryll completed the score.  Cellier owed much to the influence of Sullivan. He was a fertile melodist, and his writing exhibited elegance and refinement, although he was not able to infuse his music with humour in the way that Sullivan did.  Cellier died at his home in Bloomsbury, London, at the age of 47. He was buried in West Norwood Cemetery.
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Are there any other interesting aspects about this article?

Answer:
Dorothy had been announced for production at the Royalty Theatre in 1884,