( 45 * ) 
as.is likewife the lower TropickDD. EE, a moveable, 
graduated Meridian, turning on the Axis FF. G an, 
Index to fix it (by the means of the Screw H), 
to any Hour. I i J, a circular Beam-compafs, the 
Center I i to be fixed on the Meridian to any Dc- 
gree and Minute of Declination, by the Method 
commonly called Nonius’s Divifions : k the Point, 
for drawing Arches, which is likewife fixed to any 
. Degree and Minute by the fame. Method. As the, 
Meridian is at fome Diftance from the Globe, L is 
a piece of Brafs to fix on the Meridian, marked 
with Nonius’s Divifions, with a Point reach- 
ing down to the Interfeclion of the Arches, by. 
which means the Diftance of the laid Interle&ion 
from the Equator, or its Latitude is found. The: 
Degrees and Minutes ma.y likewife be lliewn by 
diagonal Lines. 
The T)fe of the Infirumentr. 
I. PROPOSITION. 
From two Obfervat ions of the Height of the S r un 9 
the "Difiance of the faid Obfervat ions in Time , 
being given by a W atch , as. likewife the "Declina- 
tion oj the Sun; to find the Latitude of the "Place , 
and Hour of the "Day, 
I. When the Ship is at Reft , that is , at Anchor , 
or in a Qalm> fo as to have little or no progrefiive 
Motion, 
Cafe i. 
N 
