[ 2 4 6 ] 
day, and the Sun fhining bright; as alfo Mercury , 
Venus , and Jupiter: Saturn and Mars are not fo 
eafy to be feen, upon account of the Fainrnefs of their 
Light, except when the Sun is but a few Hours above 
the Horizon. 
And in the fame manner in the Night-time, when 
you can fee a Star, Planet, or any new Phamomenofi, 
fiich as a Comet, you may find its Declination and 
Right Afccnfion immediately, by turning about the 
Equatorial Handle, and Declination-Handle, till you 
fee the Star, Planer, or Phenomenon; and then, 
looking upon the Equatorial Plate, you find its Right 
Afcenfion in time ; and you find, upon the Declina- 
tion-Semicircle, its Declination in Degrees and Mi- 
nutes. 
In order to have the other Ufes of this Inftrument, 
you mud make the Equatorial Plates become parallel 
to the Horizontal Plates; and then this Inftrument 
becomes an Equal Altitude Inftrument , a Tranjit 
Inftrument , a Theodolite, a Quadrant , an Azimuth 
Inftrument, and a Level. The manner of applying 
it to thefe different Purpofes is too obvious to need 
any Explanation. 
As there is alfo a Box with a magnetic Needle 
fattened in the lower Plate of this Inftrument, by it 
you may adjuft the Inftrumenr nearly in the Meridian ; 
and by it likewife you may find the Variation of the 
Needle: If you fet the Horizontal Meridian, and the 
Equatorial Meridian, in the Middle of their Nonius 
Indexes, and direct your Telefcope to your Meridian 
Mark, you obferve how many Degrees from the Me- 
ridian of the Box the Needle points at ; and this Di- 
ftance or Difference is the Variation of the Needle. 
XII. 
