Was there life before computer?

calculating instruments before the digital era


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The Educated Monkey


A very particular multiplication table of great success was the fun Consul Monkey. It allows the children to learn the multiplication tables without effort as the advertising said: "No matter if the students are lazy or careless, the monkey never loses patience".

To multiply must place the paws on the numbers and the result magically appears between the "hands". You can also insert a card that allows you to add: in this way the children understand the relationship between addition and multiplication, It' a true programmable calculator! Of course it also performs divisions: the dividend fits between the "hands" and the result is read at the left paw. Still in commerce and it is used in many schools.

This is its the emulation written in Java by Reinhard Atzbach. Visit his website full of informations about old calculating machines. Here you can download the executable program.


 

Back to the moltiplication version


To add ajust each of the monkey's feets to point directly at the addends: the momkey's hands will when locate the sum of the two numbers, to subtract it is so easy that do not needs instructions.




Nicola Marras 2008

Credits: Reinhard Atzbach

      

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