# Jaap's Mechanical Calculators Page

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The Aderes is a column adder that is based on the Adix machine from 1903. Column adders are small machines that allow you to sum up single digits. You use them to add up each column of a larger sum.

## Calculation

As a simple example I will explain how you use a column adder to add the following 5 two-digit numbers:

``` 71
63
56
19
32
--- +
...```

You would enter the digits of the right column into the adder, to get 1+3+6+9+2 = 21. You then write down the 1 and carry the 2 to the next column.

``` 2
71
63
56
19
32
--- +
..1```

Reset the adder and enter the numbers of the second column, including the carried-over 2. This gives 2+7+6+5+1+3 = 24. You then write this down to get the full answer.

``` 71
63
56
19
32
--- +
241```

## History

The Adix was developed by Joseph Pallweber in 1903. He was a clockmaker based in Mannheim, Germany. The first version of this machine had a rather convoluted methods for resetting the counter to zero, which involved holding down the 1 button, and turning various gears by hand. For this reason, the machine was not enclosed in a casing when in use. Joseph Pallweber together with Adolf Bordt set up the Adix Company to develop and sell these machines. Despite the complicated reset procedure, they sold reasonably well as they were cheaper and quieter than proper calculators.

The Adix Company made these machines until the 1920s, by which time Pallweber had left to invent other things, and Bordt was trying to move the company on to making a full calculating machine.

Johann Zähringer was a manufacturer and supplier of many of the parts for the Adix, based in Schönenbach, near Furtwangen in Germany. He eventually took over the full production of the Adix. They were sold in Germany and France under various names including Adix, Aderes, Amifo, and Reports, and production continued up until the 1950s.

These machines now had a simple reset lever, and as there was now no need to expose the mechanism, they were enclosed in a bakelite case, and the keys were given button tops instead of being just metal tabs. It is unclear who developed the reset mechanism - an early Adix clone called the Certa had a very similar mechanism already.

This is my Aderes column adder. There is no serial number, and it is very difficult to say when it was produced, and it could be anywhere from the 1930s to the 1950s. It is in excellent working condition, and comes in a plain cardboard box. The instruction leaflet is missing. It has black keytops like most other Adix variants, though some Aderes-branded adders have white keytops.

Below is a video I made that demonstrates how the Aderes is used and how it works.

## Patents

PatentFiling datePriority dateNameDescription
US 7,07405-02-1850Parmelee, Du Bois D.Calculating Machine (Simple column adder)
FR 430,84024-08-191125-11-1911Bordt, AdolfAdix with manual register for setting result, sold as Diera