The fundamental equipment of the modern Observatory must include an equatorial and a meridian circle. Dunsink was now provided with the former, but there was no meridian circle. The great Ramsden instrument had become obsolete. The old transit had also seen more than half-a-century of service, and could not be relied on for accurate work. A splendid meridian circle was therefore ordered, by the liberality of the Board, from Messrs. Pistor & Martin, of Berlin. It was erected in 1872-1873, at a cost of £800. The aperture of this instrument is 6·4 inches and the length is 8 feet. The circles are divided to two-minute spaces, and read by eight microscopes, four on each side. The instrument can be reversed, and has north and south collimators. The Meridian Room and the fine instrument just described are shown in the subjoined illustration. [Illustration: MERIDIAN ROOM, DUNSINK.] In 1874 Dr. Brünnow resigned, and was succeeded by the present writer; and about the same time Dr. Ralph Copeland was appointed assistant. In the following year Dr. Copeland went to the Earl of Crawford’s Observatory at Dunecht, and he now fills the distinguished position of Royal Astronomer of Scotland. Dr. Copeland was succeeded as assistant at Dunsink by Mr. C. E. Burton. Failing health caused Mr. Burton’s resignation in 1878, and Dr. J. L. E. Dreyer then came to Dunsink, where he remained till the death of the late Dr. Romney Robinson in 1882 created a vacancy in the post of Astronomer at Armagh, to which Dr. Dreyer was then appointed. His place at Dunsink was filled by Dr. Arthur A. Rambaut, the present assistant. Among the additions made to the Observatory under my direction may be mentioned an electric chronograph for recording transits. A time service has also been in operation for many years, by which the standard mean time clock in the Observatory controls, on Jones’ system, the Front clock and the Board-room clock in the Port and Docks Office, Westmoreland Street, Dublin. The ball falls at this office at 1 p.m., Greenwich time, and the fact of falling reports itself automatically at Dunsink, while the Front clock reports itself at Dunsink every minute. But the chief addition to the Observatory in late years is the superb reflecting telescope for photographic purposes, which is the gift of Isaac Roberts, Esq., F.R.S., of Crowborough, Sussex. This instrument has been established in the small dome on the top of the Observatory. The last chronicle of Dunsink that it may be necessary here to mention is that Sir Robert Ball was appointed, on 20th February, 1892, to succeed Professor J. Couch Adams as Lowndean Professor of Astronomy in the University of Cambridge. [Illustration: (Decorative chapter ending)] FOOTNOTES: [107] Graves’ _Life of Hamilton_, vol. i., p. 46. [108] Life of De Morgan, by his wife, p. 333. [109] _Ibid._ [Illustration: (Decorative chapter heading)] CHAPTER VII. “_The Books, but especially the Parchments._” THE LIBRARY.