'With an Equatorial Micmftietefc $*9 
half are taken upon the wire B, and for the fame reafon denote 
a 'declination north. The fcale of the micrometers of each 
wire begins from a point affirmed fomewhat without the field, 
and the number increafes from thence towards the center of 
•the field, and continues beyond it ; the integral parts are the 
turns of the fcrew, and the centefimal the divifions of the 
index plate, being divided into ioo parts. The point of the 
fcale, anfwerable to the center of the field of view, having* 
been found by obfervations on each fcale refpectively ; when 
the wire A ( Aujiralis) {lands at 30.84, it is in the center of the 
field ; and when the wire B ( Borealis ) is at 28.1 1, it alfo cuts 
the fame center. Hence the parts of the micrometer being 
refpectively taken from thofe two numbers (which may there- 
fore be called ccnjiant numbers) the remainder will be the 
diftance of each refpedtive wire from the center in parts of the 
micrometer. Thus, in the obfervation of 0 Tauri upon the 
23d, the parts are B 8.39; this taken from 28.11, leaves 
N 19.72, which are placed in col. 8. as the diffance, in parts 
of the micrometer, that 0 Tauri paffed north of the center of 
the field of view, or axis of the telefcope. 
In like manner, in the obfervation of Mercury on the 23d* 
the parts are B 28.85 ; but this being greater than the conftant 
number 28.11, the excefs will be .74 parts; which being the 
parts reaching beyond the center, they will be fo much fouth 
of it, and are fet down therefore in col. 8. S 0.74 : and in this 
manner the declinations of the reft are made out, from their 
refpedlive numbers of parts of the micrometer, and fet down 
in col. 8. 
The numbers of the fixth column of Tab. 1. are transferred 
to the third column of Tab. III.; and the declinations fet down 
in parts of the micrometer, Tab. I, col, 8. are transferred to 
col. 7. of Tab. Ill, 
Ebbs Cob 
Ebbs 
