Picked up this little book from 1902 in a charity shop. It’s a list of multiplication tables for pre-decimalised British currency, which was hard to calculate in your head. So for example, in the close-up we see, 31 × 8 shillings and 6 pence is £13, 3 shillings and sixpence.

Lookup tables like this always interest me. Research the history of ENIAC to see the moment history started to pivot away from the requirement for these to exist and to be manually calculated by ‘computers’ — women, often.