Jaap Scherphuis | The Checkbook Balancer, a small two-sided adding machine @jaapsch2 | Uploaded May 2019 | Updated October 2024, 1 minute ago.
This small adder is called the Checkbook Balancer. There are many similar adders, but what makes this one unusual is that it is two-sided. On the reverse there are also six dials, and those can be used to subtract a value.
For more information on this or any other mechanical calculator in my collection, visit my website:
jaapsch.net/mechcalc
0:00 Introduction
1:00 Addition
1:18 Subtraction
2:08 History
2:50 Outro
This small adder is called the Checkbook Balancer. There are many similar adders, but what makes this one unusual is that it is two-sided. On the reverse there are also six dials, and those can be used to subtract a value.
For more information on this or any other mechanical calculator in my collection, visit my website:
jaapsch.net/mechcalc
0:00 Introduction
1:00 Addition
1:18 Subtraction
2:08 History
2:50 Outro
