‘THIS circle, (fig. 1.) is compofed of
numbers, from 12 to 75 inclutive,
divided into eight concentric circular
fpaces, and ranged in eight radii of
numbers, with the number 12 in the
centre ; which number, like the center,
is common to ali thefe circular {paces,
and to all the radii.
The numbers are fo placed, that the
fum of all thofe in either of the con-
centric circular fpaces above mentioned,
together with the central number 12,
make 3605 equal to the number of
degrees in a circle.
‘The numbers in each radius alfo, to-
gether with tke central number 12,
make juft 360.
The numbers in half of auy of the
above circular fpaces, taken either above
or below the double horizontal line,
with half the central number 12,
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