( 33 ) 
V,fhe Difference infimeof the Meridians of dt~ 
wrfe Places computed from Obfervations of the 
Echoes of JupiterV Satellites, by the Reverend 
Mr. Derhain Canon of Windfor, and F. R. S. 
S I R T’homas Derham, at Florence havin? lately fa- 
voured me with his Tranfcript of Monfignior Bian~ 
s Obfervations of the Eclipfes of Jupiter's Sa^ 
telhtes.hom the Year lyn, I have laid them down 
» ?” Service of the 
faith, they were made with 
aXelefc^e aiCampani's grinding of 13 . Roman 
Palms: That Father >. Rapt. Carboni i Lisbon 
made ufe of fuch another of the fame Make, Length 
and Goodnefs ; and therefore thinks the Times afligned 
Meridian-Lines at 
jdff/i mOmbrta £f Vrbtno-^ss. St. ffuirico in fufcanv 
^f^fjorence- And that Monfignior Eujach. Manfre- 
ds at the Obfervatory of Bologna, and he obferved the 
Immerfion of the firft Satellite on ly Auguji within 
two beconds of one another Manfred i with a Glafs of 
^ Bononta Feet and he with one of ii; both made by 
.Campmt. With his own, Bianchini hath inferted 
feme Obfervation.=, „}ade at the Came time by Father 
Carbomsi Lisbon, and Father Grammatici at Ingol- 
f ad ; Monfieur Maraldi at Paris, and Monfig. 
nior Eufachtus Manfredi at Bologna ; as alfo 
an Immerfion obferved by Mr; Molyneux near Lon- 
don (1 fuppofe at ATm) with his reflefting Telefcope. 
and two atTete m China by Father Ignatius Kogler 
a JeJmt-.^m I fuppofe there is a Miftake in the Ob- 
servation o( November 30, I7^4, that it was an Emer- 
lion not m Immerfion ; the Immerfions of the firft Sad 
teutte being not to faefeen then. 
F 
Sir 
