It may be observed, that there is not one of the numbers but what belongs at least to two of the different circular spaces; some to three, some to four, some to five; and yet they are all so placed as never to break the required number 360, in any of the 28 circular spaces within the primitive circle.
These interwoven circles make so perplexed an appearance, that it is not easy for the eye to trace every circle of numbers one would examine, through all the maze of circles intersected by it; but if you fix one foot of the compasses in either of the centres, and extend the other to any number in the circle you would examine belonging to that centre, the moving foot will point the others out, by passing round over all the numbers of that circle successively. I am, &c.
B. FRANKLIN.
FOOTNOTE:
[62] In the plate they are distinguished by dashed or dotted lines, as different as the engraver could well make them.
TO THE REV. FATHER BECCARIA.
[Describing a new musical Instrument composed of Glasses.]
London, July 13, 1762.
Rev. Sir,