[008] Lego Technic - Pascaline #01

this is a Lego replica of the mechanical calculator called Pascaline, invented by the mathematician, physicist, inventor, writer and Catholic theologian Blaise Pascal in 1642

this version has 6 number positions, all base-ten, and can add multiple terms until 999,999, it can also subtract by means of 9's complement

in this video I made the following operations:

985 + 547 = 1,532

1,532 + 9,724 = 11,256

zeroing

2,753 - 847 = 1,906

1,906 - 956 = 950

it works exactly like the original models built by Pascal, with two differences:

since there are no 10 teeth Lego gear, I used the 20 teeth model, which means that the mechanism 'counts two teeth' for each number

the input of the real Pascaline allowed the user to dial the numbers, much like rotary dial phones, but since I don't have any lego parts which can mimic that, the input is more difficult: the operator has to count positions to enter the numbers

the last images show details of the centerpiece of the Pascaline's carry mechanism: the sautoir