Slide rules HOME page COLLECTION 20" RULES
Make Faber Castell, Germany
Model 4/60/380

1. Rules of this size (20" = 50 cm) were designed for increased accuracy.
2. The rule has a very basic set of scales.
3. There are windows on the back with hair lines on the stock for sin and tan (left) and log (right). The sine scale goes from 35' to 90 and the tan scale from 35' to 45.

Front view - left
2001-fabercastell-460380-01.jpg (29943 bytes)

Front view - right
2001-fabercastell-460380-02.jpg (16581 bytes)

Detail - front view
2001-fabercastell-460380-03.jpg (18651 bytes)

Detail - back left
2001-fabercastell-460380-04.jpg (19863 bytes)

Manufacturing date May, 1937 (stamped on back)
Length 20"
Material Plastic on wood
Scales A, [B, CI, C/ S, L, T] D
Gauge points p: 3.14: A,B,C,D
r' : 3438 : C,D
r" : 206255 : C,D
M: 31.8: A,B
Cursor Glass with aluminium frame
Hair lines  
Documentation None
Condition Good