A lot of calculating machine from different times are on display and John Napier and his arithmatic inventions are part of this trasure. There is his Rabdologia (1617) where he described his famous Napier’s bones or rods and we have also some examples of them.
The box located in the bottom of the picture is Napier’s own Napier’s bones. There other sexagessimal bones are also very curious:
Napier’s bones were very popular and they were used until the 19th century as we can see them in this wooden box:
The exhibiion continues with “The Art of reckoning”:
As the level of trade increased throughout the Renaissance, the European counting boards and abacusses were gradually replaced by the use of pen and paper. Merchants andgentlemen taught themselves and their sons the new method.
In England, during the 16th and 17th centuries, many books were written encouraging people to learn arithmetic, and many gadgets invented to aid the beginner. By the 18th century, ready reckoners, devices to simplify calculation, were available to many tradesmen.
These words introduces all the calculating machines world but it’s also the moment of the former counting methods. For example, what do you think about this replica of a 16th century counting cloth?