C 521 ] 
on an axis inclined 2 3^ degrees. On this axis is an 
index, which goes round a dial-plate of 24, hours in 
each rotation of the globe. 
2. A circular plate, on whofe limb are inferted the 
months and days of the year. This plate fupports 
the globe, and, by turning it till any given day comes 
to a fixed pointer called the annual index, gives the 
axis of the globe the fame pofition to the fun, or to a 
candle properly placed, that the earth’s axis has to 
the fun on that day of the year. 
3. A penumbra, or thin circular piece of brafs, 
divided into twelve digits by concentric circles, which 
reprefent a fedtion of the moon’s penumbra, and is 
proportioned to the fize of the globe ; fo that the fha- 
dow of this plate, formed by the fun, or a candle 
placed at a convenient diftance, with its rays tranf- 
mitted thro’ a convex lens, to make them fall parallel 
on the plate, covers exadtly all thofe places on the 
globe, which the moon’s fhadow and penumbra do on 
the earth. So that any folar eclipfe may be fhewn 
with this machine, by candle-light, almoff as well as 
by the light of the fun. 
4. A frame, on the two upright fides of which arc 
feales of the moon’s latitude, or declination from the 
ecliptic. To thefe feales are fitted two fliders, with 
indices for adjufting the penumbra’s centre to the 
moon’s latitude, as it is north or fouth, afeending or 
defeending. 
y. A crooked wire, which always points to the 
middle of the earth's enlightened difk. 
6. A folar horizon, dividing the enlightened from 
the darkened bemifphere of the globe, and fhewing 
at what places the general eclipfe begins, is at the 
"Uiiu greatefl 
