PIAL, 
-ebjeftion ts, that the hour cannot fo well be known at a dif. 
tance. ‘The moveable plate being fmall, and equally poifed, 
free ion. 
ed: the hand is carried 
-wheel in the afual way, and a tubed 
7 canon pinion, 4@ ma 22 leaves, is put on tight, in the 
n manner, Sach gives its velocity toa kee b, of a 
flan aaa and this pinion 8 made 
turns ona n the front of the frame 
sli of ve cone with the fir and covering it, rou 
the tube of the little bridge that takes off the fridtion as 
ufual, fo-that, as the velocities of the firft and third pinions 
are to each other marl as their du sageide numbers of 
leaves, the revolving hand and hour-plate move with the 
velocities 24 and 22, that i is So and 5 5) as before ftated. In 
this mode of indicating time, three pinions without wheels 
are all that are neceflary or ig baraoeia tial whereas three 
ecls and one pinion, or tw wo pot are 
aly wanted to make the velocities of as hands 12: 1. 
But this fimple mode of indicating time has no connec- 
tion with the other motions in the ae part of the dial- 
work, and the indication might be ed in the ordinary ¢ 
way without Gntesteria ng with one follows, provided the 
ftriking work fhould be introduced and require it. It may 
Be proper to aaa - that the long fi ea pinion will aét 
better when made not quite mae but like two ee 
varying a little in diameter, placed clo a in per he 
eel ¢ in fig 8 
— 
os 
7 
= 
m 
-3 
° 
eo 
SS. 
® 
ie) 
oO 
= 5 
on te more parti- 
cularly how the multiplication from 12 hours to feven days 
arifes, as the operation is of as fimpleft nature; being only 
as 1 to 14; the aroor of this wheel c, which has 32 teeth, 
earries the he hand pe incite out the feven days of t 
week in one of the tw ng {mall divided circles 
im fig. .23 - this ake 1 of 32 teeth is a large one of 135 
driven, which is concentric with the lunar che, that is car- 
135 
& f 
o 
ried round by its arbor in ->~ 5 Of 7 days, or in 29° 12" 45™. 
The arbor of this large eae 1, as well as that of whee 
32, paffes ee eg plates of the clock frame, and is 
f the moon’s plate is 
rojedts and receives pala cee : iat ie a lune on 
it points out the mo utermoft circle of 293 
{paces of Arabic charaert and alfo ie time af fouthing i in 
the fecond circle of Roman numerals; the ftraight hand in- 
dicates the time of high aa at each tide in a faid fecond 
circle, when fet for any particular place at new moon; an 
the third hand, that has a crofs near its extrem 
att 
tached a pinion: of: Dif. leaves, not feen, driving a wheel d, of 
107 teeth round a ftud in the front plate, and another pone 
of 31 — faft to it, aCtuates a fecond wheel of 86 teeth 
round, in a ‘ of — ~ of 29% 12° 45", which period reduced is 
I™ 5°, on a hand, inferted on its arbor, points out the 
ecliptic, correfponding i 
Sige to the week, circle, in which the days are indicated. 
i 
Upon the annual arbor of wheel 86 is alfo put a imall cir. 
which fits into a round 
for eieceaes be the moon’s age 
the fame age looked ae in < little tne circle of 293, 
{ponding ee round the 
mon ftem; the 98 drives a fellow 
e former pair of aes regulate the plate of 
9 
ufed s, but he 
atte wu hel purpofes have been chofen for the eve ufes 
her inftruments of serene ee 
ee pra the periods i by t 
re{pectively wes and 8$ civil years: and celcrece t 
and is feen at any time, the latitude is indicated thereby on 
the innermoft circle, and the moon’s a eeraae with refpeé to 
and confequently her 
g on her 
{pe&tion, and might e 
plate were marked ects hs and fubftituted for the double 
hand. The pofitions of the re{p ective hands, and {mall Leelkes 
are for Monday bee at of the year 1808, when the 
age is 12, her fitua t perigee, and alfo a figle to ie 
north fide of the afcending node, the {un’s place, a little fhort: 
of the middle of Cancer, and the moon’s, a few degrees hort 
In our article Crono 
and feconds, are conftantly indicated at th ime, and 
age beat the fun’s mean right afcenfion alfo, which is 
e difference between mean folar and fidereal time, at any 
a inftant ; and as we promifed to defcribe the ee 
under the prefent head, we propofe to introduce it 
Fig. 1. of Plate XXXIII. isa ae = the wheels and 
pinions employed in the motion-wor ig. 2. 18 ree - 
ey san ae dials, a whic theres are ee ‘one .e large and 
e {mall, a the three hands; ,both figures being of 
ce rea al fize. “We will aaa 1. firft ; res oe 
ae we have pr itiey the letters of reference 
n the margin of the face to avoid confufion, a fae rene 
by doted firsight lines to the centres to which they 
ively belong, and where the reader is defired to conceive 
them plac ae. at the centre a, the hour-wheel or centre- 
wheel arbor ibe bg as ufual, from the fate of the chrono- 
meter, and takes the minutes-hand round the large circle, 
pat a the {mall face to the right i a folar hour 
n a tube of fteel that fits tight by friction on te faid arbor, 
mick tube is {quared as ufual to jiagh [ = 3 to the 
lower extremity of this tube, or cannon workmen call 
it, are attached two cannon pinions, ie inferior one Rd 8a. 
cae 
E 
