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with its dimensions engraved into the wood so the markings will not rub off with handling
Opthalmoscope
No batteries
Mockingbird
Napier's Local Arithmetic Board | STEM Montessori Math Learning Tool surgeon puzzle with its dimensions engraved intoJohn 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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