i. 
300 T. Hill on the Occultator. 
Of course our model of the earth need be but a skeleton 
model, and such is “the Occultator.” It consists essential 
of five parts. I, The moon’s meridian, Aa, standing vertical 
upon two feet, and readily arranged by means of a projecting 
oint on one foot and a cross scratch in mica in the other, to 
stand parallel to the meridians of A.R. in the chart, In the 
cut the projecting point in the hind foot ee out of sight. 
whic 
(axial or polar) arm, 
RR, and the graduated 
sal" limb of A, is set to the 
declination of the moon 
chart). ie 
III. The meridian of 
the observer, xX, W2 
by the graduated limb 
of the equator 1s rea 
set to the hour angle. 
In the cut the hou 
meridian, xX, t0 
he cut 45°. 
at 10 ane 
0 = meridian as an axis, and use Bessel’s coordinates 
plot the moon’s path, : ane 
(c) But the best practical method yet tried is to pee ap 
y and permanently the moon’s path on the chart 
