I came across this back-of-the-page sketching in an 18th century collection the other day. It is simple addition of sums in pounds, shillings, and pence. 
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My ISI infographic
A doctor of history fixes broken stories.
I came across this back-of-the-page sketching in an 18th century collection the other day. It is simple addition of sums in pounds, shillings, and pence.
Michael J Douma 