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No batteries
and woodpeckers - into an aviary shaped frame
find the 1st letter of your message and align it with the arrow next to this wheel
It is made in Hudson
Napier's Local Arithmetic Board | STEM Montessori Math Learning Tool surgeon puzzle No batteriesJohn Napier was a brilliant Scottish mathematician who lived from 1550 to 1617. He developed a number of methods to simplify mathematic operations most notably logarithms but also some calculation tools like Napiers Bones and this Local Arithmetic Board. This board will allow the calculation of 2 numbers, though each number must be less than 512. It's an amazing thing to use this board and get a sense of the history as well as the mathematics behind
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