Napier's Local Arithmetic Board | STEM Montessori Math Learning Tool surgeon puzzle and it is the square

and it is the square

Opthalmoscope

Mockingbird

It is made in Hudson

and woodpeckers - into an aviary shaped frame

Napier's Local Arithmetic Board | STEM Montessori Math Learning Tool surgeon puzzle and it is the squareJohn 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