at Kew, made those observations which led to the
discovery of the aberration and nutation: here also is Dr. Hooke's
reflecting telescope, and three telescopes by Harrison. On the south
side of this room is a small building, for observing the eclipses of
Jupiter's satellites, occultations, &c., with sliding shutters at the
roof and sides, to view any portion of the hemisphere, from the prime
verticle down to the southern horizon: this contains a forty-inch
achromatic, by the inventor, Mr. John Dolland, with a triple
object-glass, a most perfect instrument of its kind; and a five-feet
achromatic, by John and Peter Dolland, his sons. Here, likewise, are a
two-feet reflecting-telescope (the metals of which were ground by the
Rev. Mr. Edwards), and a six-feet reflector, by Dr. Herschell.

The lower part of the house serves merely for a habitation; but above is
a large octagonal room, which, being now seldom wanted for astronomical
purposes, is used as a repository for such instruments as are too large
to be generally employed in the apartments first described, or for old
instruments, which modern improvements have superseded. Among the former
is a most excellent ten-feet achromatic, by the present Mr. Dolland, and
a six-feet reflector, by Short, with a clock to be used with them. In
the latter class, besides many curious and original articles, which are
deposited in boxes and cupboards, is the first transit instrument that
was, probably, ever made, having the telescope near one end of the axis;
and two long telescopes with square wooden tubes, of very ancient date.
Here, likewise, is the library, which is stored with scarce and curious
old astronomical works, including Dr. Halley's original observations,
and Captain Cook's Journals. Good busts of Flamstead and Newton, on
pedestals, ornament this apartment; and in one corner is a dark narrow
staircase, leading to the leads above, whence the prospect is uncommonly
grand; and to render the pleasure more complete, there is, in the
western turret, a _camera obscura_, of unrivalled excellence, by which
all the surrounding objects, both movable and immovable, are beautifully
represented in their own natural colours, on a concave table of plaster
of Paris, about three feet in diameter.

On the north side of the Observatory are two small buildings, covered
with hemispherical sliding domes, in each of which is an equatorial
sector, made by Sisson, and a clock, by Arnold, with a three