1801. ] 
he is now occupied in making one of platina, 
feven inches and a half in diameter. 
C. Tremel has begun a new ftand for the 
22-feet telefcope, on a more eligible and fo- 
lid conftruétion. A new terrace is erect- 
ing to the fouth, which is tobe level 
with the lower chamber of the obfervatory, 
on which the telefcope is to ftand. 
Father Noél, the Benedictine, in 1772, com- 
pleated a telefcope, the reflector of which had 
24 feet 4 inches focus, and 22 inches anda 
half diameter. He affirmed that it magnified 
4.30 times; but Mr. Shuckburgh. eftimated 
it only at 200, WNoél valued it. at $0,000 
“livres; but Louis the XVth expended more 
than 500,000 livres in its conftruétion. The 
{inall refl-Gtor was convex, having 5 feet ef- 
timated focus, which dimiaiihed the length 
of the telefcope. The eye-glafies of 3 and 24 
inches focus magnified 528 times; but they 
did not well fupport fuch an enlargement. 
Noel defpifed all aftronomers ; he would 
not permit me to fee Jupiter through his 
telefcope. ‘¢ If,” faid he, ‘* you find it good, 
you will add nothing to my credit, for I have 
already acquired all I wifh for; if, on the 
other hand, you find it bad,- you would in- 
jure me confiderably.” 
Father Noel had formerly been a tallow- 
chandler, atAmiens, where he became a bank- 
rupt. He was knewn to the Duke de Chaul- 
nes, who, impofed on by his loquacity, intro- 
duced him at court, in order to difplay a mi- 
crofcope, which he mott probably never made. 
He had apartments allotted him at the Ab- 
baye, where he aflociated with Navarre, a 
pretty good optician, and then he propofed to 
the King to undertake a telefcope, twice the 
fize of thofe in England. The Hotel-de-Pafly, 
nearthe chateau Muette, was accordingly af- 
figned him, where ke worked till his death, 
in 1781. 
Rochon, who fucceedea him, employed 
Caroché, who prepared the mirror, and render- 
ed this telefcope as good as Herfchel’s, ac- 
cording to his own afflurance given to C. Mé- 
chain and myfelf, in1788. The obfervatory 
will henceforth be one of the beft furnished 
that we have. 
C, Janvier, the celebrated clock-maker, 
has prefented a beautiful clock to the Infti- 
tute, in whichare reprefented, by his inge- 
Muity in mechanifm, the moft difficult things ; 
the nodes of the moon, the preceflion of the 
€quinoxes, and the two parts of the equation 
of time. He has alfo prefented another ma- 
chine, which includes new inventions for 
eclipfes, the tides, the fatellites, the annual 
parallaxes, the true movements, and in which 
machine the motions are not increafed fo as to 
affect the moving power of the regulating 
wheel. . 
The King of England gave 3co0o guineas 
to M. Schroter fof his infttuments, which 
are to be regarded as the property of the uni- 
verfity of Gottingen. 
9 MONTHLY MAG, NO, 71, 
De Lalande’s Hiftary of Aftronamy for the Year, 1800. 
22.5 
The Duke of Gotha has procured for his 
obfervatory a three-feet circle, made by 
Troughton, who actually rivals Ramfden. 
This circle coft fa,000 francs, He has order- 
ed a great fector to obferve the zenith, and a 
16-feet telefcope of M. Schroter ; i and, he has 
fo far extended his zeal and munificence, as to 
ordera feven-fect telefcope for M. Wurm, to 
enable him to fatisfy his thirit in aon cat 
cal refearches.. In fine, the Duke has ordered 
from Paris one of Ram{den’s equatorials, the 
circles of which meafure 10 inches 1 in diameter, 
and give the precifion of 30”. Itis the fame 
which was made for Berge: ne and purchated 
by Patu de Mello, who, though uninformed, 
was fingularly remarkable for po! effing rare in- 
ftruments and good books. Amengothers, he 
had the Offervations of He “velips, oF w fick go 
copies only are in exiftence, the edition having 
been burnt, i in 1679, throughthe malice of a 
villain. This volume was parchafed by C. Lab- 
bey, Mathematical Profeffor of the Central 
School at the Peale with all the other 
works of Hévélius, of which he is now the 
worthy pofleffor, ‘Troughton has alae 
made 50 circles, in imitation of ours, with fome 
ufeful alterations. -He did not conceive, that 
from the circumitance of his being an Englifhs 
man, he fhould be debarred from profiting by an 
invention for which the world is principally 
indebted to France. 
The King of Pruffia has granted 20,00 
francs for ae Gbiervatory at Berlin, where 
M. Bode wasin want of many necefiary articles. 
He has purchafed one of Doliond’s meridional 
glaffes, three fect and a half, and has appro- 
priated a new chamber above that in which I 
had placed the mural in 4751 
The Adjutant-General d’ Abancourt, by or- 
der of the Cornmanderin Chief, is occupied on 
a map of Bavaria, onthe fame fale as the great 
map of France, and he has fent us the founda-: 
tion of his work. This map will bind with 
that of Suabia, which was formed on the fame 
fcale by M. M. Bohnenberger and Amman. 
The map of ees is forming by M. 
Delecog ; that of the Low Countries has al- 
ready been executed on the fame icale. Thus 
the example of France becomes fruitful, and 
even the Englith prepare to imitate us, 
The ‘Swedith Academy has fent i. Syan- 
berg to Torneo, to examine the itation where 
the French Academicians made their obferva- 
tions In 1735, for the admeafurementof a de- 
gree. As this degree appears too great, fome 
errors have been apprehended, and a new ad- 
meafurement is deemed requifitee M, Me. 
landerhielm has fent to Paris for a circle, on 
which workmen, are now occupied. But as 
there have been difcovered palpable irregulae 
rities in the meridional degrees, from Dunkirk 
to Rarcclona, it will not be furprizing if fuch 
are found in 66° of latitude. 
The King of Denmark has eftablifhed a 
longitudinal office, of which M. Buggeé and 
two others are directors. MM, Loowendern 
Gg princi+ 
~ 
