Watch the elegant division algorithm: subtract the divisor repeatedly, count how many times, then shift and repeat for each quotient digit
Division on a mechanical calculator works by repeated subtraction:
1. Enter dividend in accumulator
2. Set divisor on input
3. Position carriage at leftmost position
4. Subtract (crank CCW) until result goes negative
5. Add once (crank CW) to correct
6. Shift carriage right, repeat