Faber-Castell 342 Columbus System Rohrberg



Back of the slide




Length 39 cm
Number of scales 10
Country of origin Germany
Country of manufacturing Germany
Year of manufacturing  
Status of the slide rule Normal signs of use
Material of the slide rule Celluloid on wood
Status of the box Slight damage
Status of the manual None
Collection number 113
Further comments Before 1940 Faber-Castell introduced several slide rules for commercial use, that were based on the System Rohrberg. This 342 is one of them.

I have not been able to figure out yet how it works. There are a number of scales that resemble the later 22 -series slide rules (like the small scales on the top of the rule), but others are very different.

The 342 also has an odd size; it falls in between the 10" and the 20"slide rules.

There is not date stamp in the back, but looking at some characteristics it should be dated between 1923 and 1935.

The rule has a faded stamp "Siemens Aktiengesellschaft"in the well.


 Last updated: 04-09-2009