DK. lIEflSCHEL’s eSAKD TELESCOPE, S3! 
dually rich ; as is likewise that of the '‘marine productions, 
miscellaneous articles are numerous, and skilfully 
^'ected. 
,^'he Armory of the Museum is fitted up in an appro- 
pate and elegant manner, representing the interior of the 
of one of the castles of our ancient nobility : the ar- 
/’“tir and various instruments of war are displayed in tro- 
™'es, or on figures, placed under gothic canopies, 
j ^either pains nor expence have been spared by Mr. Bul- 
jpk to enrich his museum. The travelling carriage of 
.ptaparte, — the economy of space in which is like that of 
cells of a bee-hive, — was purchased by him of Lord 
pthurst for three thousand guineas. It was estimated that, 
^ 1 ’ to the month of June, I8I7, either at the museum, or 
') Several great towns of the empire, where it has been ex- 
*''o'ted, not less than four hundred thousand persons had 
^’’tered tins very interesting vehicle. To this he has added 
‘ ttmious and cosily assemblage of imperial relics from the 
places of Napoleon the Great ; two splendid mosaic pave- 
I ®nts, recently found on the floors of the baths of Nero ; 
■po specimens of the transcendant skill of Canova, displayed 
tile figures of Hebe and Teipsichore, so admirably sculp- 
that they seem to move and breathe, &c. &c. 
DOCTOR HERSCHKl’s GRAND TELESCOPE. 
® lead to a clearer comprehension of the principle on 
*"ch the telescopes of Dr. Herschel are constructed, it is 
pt^e.ssary to advert to those of Newton and Gregory. The 
piner of these consists of a tube, towards the eud of whiclt 
converging rays, before 
Jpoticnve mirror is placed. The 
roach the focus, are made to fall on a plane mirror 
{Vd at an angle of forty-five degrees, and thrown upward 
" cus of a convex lens, fixed in the upper side of the 
, through which the eye looks down on the object. 
M. 
•]i®scope, 
rlu' 
L "7 latter consists 'of a tube, on which a conc.ive mirror, 
’ ■ ■* ' ' Any parallel rays 
on this mitTor, will, after reflection. 
a hole in its centre,' is placed. 
an object failing 
an inverted image at its focus. This image, however, 
'btercepted by a smaller minor, which reflects it back to 
Hi ’b tlis liole of the large mirror, through which 
observer views the object. 
the telescopes made by Dr. Herschcl, the object^ 
