( 365 ) 
Art. XXIX. — A very Concise^ yet strictly Accurate Method, 
for finding the Interest of any given Sum, at cmy given 
Rate, for any given Number of Days. By Henry Good- 
WYN, Esq. Blackheath, Kent. In a Letter to Dr Brewster. 
SlRj 
I have experienced, for many years, the utility of the Interest 
Table which I have now the honour of presenting to you. Se- 
veral gentlemen, of well known mathematical ability in this 
neighbourhood, have spoken favourably of it, not only as pos- 
sessing the properties above ascribed to it, but also as furnishing 
a fair example of the great benefit which may be derived from 
introducing the circles or circulating digits, distinctly from the 
prefixed digits, or finite part of the decimals, whenever mixed 
and circulating decimals are to be applied in any extent to prac- 
tical purposes. 
It does not appear to me that any description of the different 
parts of the Table is necessary, as the titles at the heads of the 
columns seem sufficient for pointing out what they severally are. 
As to the two Tablets, however, which contain the circulating 
digits of the decimals, it may be observed, that each of the nme 
circles in the tablet for £ 5 per cent, is the same ; that is con- 
sists of the same digits with one or other of those in the tablet 
for £ 1 per cent. In fact, it is this last-mentioned tablet which 
completes the Table ; and they alone, if every thing about £ 5 
per cent, were omitted, would be then, as they are now, of uni- 
versal application. It is for its usefulness, then, as the legal and 
common rate of interest, that the tablet, &c. for 5 per cent. 
has been superadded. 
That the nine circles are all which can exist in the present- 
case, that is all that can possibly arise from the division of any 
given whole number less than 365 (the days in a year) by 365, 
admits of easy investigation and proof. But for this,' as well as 
for a new mode of finding the circles themselves in all such in- 
stances, I would beg leave to refer to the second section of the 
Appendix to the Centenary,’’ and Tabular Series.” 
I am. Sir, &c. 
Henry Goodwyn. 
