[ II2 ] 
heir light, except when the Sun Is but a few degrees 
above the horizon j in the fame manner in the night 
time, v.'hen you can fee a ftar or planet, or any new 
phacnonienon, fucli as a comet, you may find its de- 
clination and meridian diftance or complement 
thereof, by turning about the equatorial handle and 
declination handle, uinili you fee the flar, planet, or 
new phaenomenon ; and looking upon the equatorial 
plate, you find its meridian diftance or complement 
thereto, and upon the declination femicircle its de- 
clination. In order to have the other ufes of this 
inftrument, you muft let it to the hour XII on the 
equatorial plate, and to o on the femicircle of de- 
clination, and fet the axis E perpendicular to the 
horizon, and then this inftrument becomes an Equal ‘ 
Altitude Inftrument, a Tranfit Inftrument, a Theo- 
dolite, a Q^drant, an Azimuth Inftrument, and a 
Level j the manner of applying it to thefe different 
purpoles is obvious. 
following is one Example of its Ufes in finding the 
Altitude of any ObjeSl. 
Set o of the femicircle of declination, to agree 
with oof its vernier index, and faften it there j fix 
likewife the vernier of the equatorial plate to 12 
o’clock, or o degrees ; then, having let the axis E per- 
pendicular, by means of the level F, turn the inftru- 
inent about horizontally upon the axis E, and verti- 
cally upon the axis of motion of the equatorial plate, 
until the objedf appears in the middle of the field j 
and the index 1 will point out upon the quadrant 
