for ascertaining the distances of clusters of stars , &c. 459 
always be found already prepared to show by inspection the 
azimuth, the elevation and the profundity of the cluster under 
examination; for as the globe, which in its adjusted situation 
has the azimuth of the cluster VI, 7, at right angles to the 
line of sight, so the globular space in the centre of the figure 
being supposed similarly arranged, has the tabular azimuth 
31 0 43' SE also at right angles to the line drawn to the figure, 
when seen from the point of sight 58° 17' SW. 
The direction from the centre of the globe to the place on 
its surface where the cluster is inserted, is also preserved in 
the continuation of it beyond the surface of the globular 
space, by the angle of its elevation 76° 58' above the northern 
plane of the milky way. 
The profundity of the cluster, as has already been noticed, 
is expressed by the continuation of the line of elevation to 
734 such parts as the radius of the globular space contains 
12 ; and it may not be amiss, by way of assisting our con- 
ception of the vast distance of the situation at which this 
cluster is placed, to state, that if a line directed to it were 
added to an 18 inch globe, supposed to contain all the visible 
stars of the heavens, its length to express this distance would 
be above 45 feet. 
This figure which, from its construction, represents all the 
different aspects in which a celestial globe should be seen, 
when its horizontal position for any cluster is adjusted by the 
foregoing table, has the imperfection that, on account of the 
different azimuths of their situation, they cannot all be 
collected into one perspective view; but as it affords the 
means of examining them separately, which may even be 
done without the assistance of the globe, this inconvenience 
MDCCCXVIII. 3 O 
