[ 5 l6 1 
The Azimuth of the Stars may alfo be obfervcd 
by Night; a proper Light ferving equally for one 
Obferver to fee the Thread, and the other the De- 
gree upon the Card. 
It may not be amifs to remark farther, that, in 
cafe the inner Box fhould lofe its Equilibrium , and 
confequcntly the Index be out of the Plane of a ver- 
tical Circle, an accurate Obfervation may hill be 
made, provided the Sun’s Shadow is dihinct : For, 
by obferving firft with one End of the Index to- 
wards the Sun, and then the other, a Mean of the 
two Obfcrvations will be the Truth. 
Explanation of the Figures . 
Fig. i. is a perfpeftive View of the Compafs, when 
in Order for Obfervation. The Point of View 
being the Centre of the Card, and the Diftance 
of the Eye two Feet. 
AB, is the wooden Cox. 
C and E) are two mill’d Nuts; by means whereof 
the Axes of the inner Box and Ring are taken from 
their Edges, on which they move, and the Friction 
increafed, when neccIFary. 
EF is the Ring that fupports the inner Box. 
G H is the inner Box ; and 
J is one of its Axes , by which it isfufpended on the 
Ring EF. 
KL is the Magnet or Needle; and 
M a fmall Brace of Ivory, that coniines the Cap to 
its Place. See Fig. 2. 
The Card is a Engle varnifhed Paper, reaching as 
far as the outer Circle of Figures, which is a Circle 
of 
