Faber-Castell 361



Front without slide

Back of the slide

Front of box
Back of box
Length 27 cm
Number of scales 6
Country of origin Germany
Country of manufacturing Germany
Year of manufacturing 1907-1920
Status of the slide rule Normal signs of use, with a damaged glass in the cursor
Material of the slide rule Celluloid on wood
Type of cursor Aluminium with glass
Status of the box Normal signs of use
Status of the manual None
Collection number 55
Further comments The 261 is a variation on the most important FC slide rule of that time, the 360. The difference is the decimal figures 1.1, 1.2....etc between 1 and 3 on the upper scales. The 360 didn't have this decimal subdivision.

This specimen doesn't have a date stamp, so dates from before 1920. It has a very special cross section that is identical to the cross section of my 366 that dates from 1921. So I would estimate that this slide rule was manufactured between 1915 and 1920. The slide rule does have metal reinforcement strips. This patent forthese strips dates from 1907.

The box is of the type that is (according to me) the most beautifull one Faber-Castell ever used.



 Last updated: 04-09-2009