ORRERY. 
_ Feet. Inches. 
°o 9 
Diameter of the globe - = < 
Small ecliptic plate = - : : ° 9 
Fixed plate of moon’s sa : 7 - © I0f 
Bri a “ long : : : o gf 
‘Brid Oo 4 
The SF menfions of {maller parts as in the plaw. 
Dimenfions of the Wheelwork. 
+ | Diameter to tl 
| Wheels. Pic Lin ay ana 
Earth. 269 12 71 
10 0.45 71 
26 1.2 8 
10 0.385 8 
94 7 8 
18 0.71 8 
Lunation. 13 0.6 7 
43 1.96 7 
73 3°33 7 
48 2.18 7 
Nodes. V4 2.05 11.5 
16 O44 IL5 
42 0.67 20 
179 2.86 20 
Apogee. 64 2.05 Io 
67 2.14 10 
46 -46 10 
4I 1.30 Ce) 
Dial work for handle. 18 O71 8 
18 O.71 8 
8 0.2 15 
56 1.22 15 
The pinions on the long arbors, as are alfo the wheels of 62, 
are optional. 
h: in fae, it ae the 
alee de ia of a tellurian fqn, planetarium, and 
ument in one machine, and is the moft compre- 
entve pec of mechanifm, for explaining the folar fyftem, 
that has yet been invented, ‘inafmu ch as that it exhibits each 
pened at moving in its own orbit, while the whole 
a {cale of magnitude that is admirably fuited for explaining 
different portions of the fyftem in diftin@ le@ures, or ep 
the firit of which portions we have already defcribed ; he co 
aie a plan of uniting all the area detached portions into 
machine, on a fmaller fca 
ed, even with tolerable a ccuracy, notwithftanding the 
great expenfe that had been aaa in the conftruétion of 
efcri 
fon, a com aaa conftruéted by Fidler under his direa lion, 
and fro nd 
ee 
the ma 
no means rer reat 
view ; as he has 
himfelf fet the example, in an Rea iiiacnt of le firfl con- 
ee it is prefumed that a minute detail of his labours 
may tend to benefit the rifing Laas 
te the inventor beyond the Jim 
einn navigation, a as s the expla- 
n 
$3 neither would it have bee 
arly as accurate as the periods collected from 
cal cables oo as — be feen in the fubjoined table 
of errors. ord vey to the re — a pee a 
into the different ence. of this orrery, as well a 
give him an idea of its ae appearance, we ole iven 
two plates of it, V III. is —— Machines 3 
one explaining Ge ent ftruGure of t ing parts in 
combination, as well as explicative of the ae that a& out 
of the cafe ; and the other oe a per{rective view 
of its external afpe he box B, which contains 
the different trains of Sac is cylindrical, 12 inches 
in diameter and three deep, fupport ed bya pillar and three 
claw = feen in Plate VII., all of brats neatly laquered ; 
the fram yin Plate VIII., which contains the trains, is 
eee into this box, oe ar ta role e, twoof which 
are feen at C and C, and m ut at ee after 
the circular cover is petnived. ecg is hae down by 
box, an 1 held 
in an maboneantat ation el a neh eye, its (eo will ap- 
pear as ser aeaaar in the lower part of Plate VII., except 
that fom he wheels conneéted with the earth’s train are 
tion here, that this part of the work one by ees 
of Red-Lion ftreet, erence in the belt manner, 2 the 
ous 
