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A W Faber "Castell" 342 "Columbus"
(50cm Scale Desktop rule, Business, System Rorhberg)
Click on the images for enlargements.
A W Faber "Castell" 342 "Columbus" (1934) |
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Summary
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System:
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System Rohrberg (DRGM 836352, 1923)
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Specialization:
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Commercial
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Type:
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Closed frame
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Material:
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Pearwood
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Facings:
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Celluliod
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Scale Length:
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50cm
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No of Scales:
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9
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Front Length:
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385mm
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Front Width:
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44mm
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Language:
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German
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Origin:
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-
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Date:
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1934, May
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Features/Notes:
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Desktop rule
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Scales (colours as shown)
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Front:
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§1, §2, §3 / D [ C, CI, CI, C ] D (see notes)
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Back:
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-
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Labels Left:
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s £, d £, E.P.% V.P.% / Val. [ Div., Val. Mult, Val. Mult, Div. ] Val. |
Labels Left:
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-
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Labels Right:
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s £, d £, / K.Z. [ Tage, %, %, Tage ] K.Z.
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Labels Right:
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-
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Style:
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Railway track
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Typeface:
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Serif
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Extensions:
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See notes
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Decimals:
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Tenths between 1 & 2 on all scales
0.5's on all scales
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Gauge Marks:
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See notes
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Rulers:
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cm on bottom edge
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Features/Notes:
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Top edge §1, §2, §3 scales are consecutive conversion scales, lengths 100mm, 120mm & 100mm respectively.
The D scales on the upper and lower rail of the stock are one continuous scale with overlap/extensions. The upper rail scale runs from 0.8 to 3.6, the lower face scale runs from 2.5 to 11. The scales are aligned at 1=Ö10 (3.162) and Ö10 (3.162)=10.
The C scales on the upper and lower edges of the slide are one continuous scale with overlap/extensions. The upper edge scale runs from 0.8 to 3.6, the lower edge scale runs from 2.5 to 11. The scales are aligned at 1=Ö10 (3.162) and Ö10 (3.162)=10. 1 and 10 are labelled in green as 1Q and 10Q respectively in boxes.
The CI scales in the upper and lower centre of the slide are one continuous scale with overlap/extensions. The upper scale runs right to left from 1 to 4, the lower scale runs right to left from 3.1 to 12.5. The scales are aligned at 1=Ö10 (3.162) and Ö10 (3.162)=10. Values 1 and 10 are labelled in red as P1 and 10P respectively, in boxes.
The C and CI scales on the slide are aligned at 1Q (upper C)=3.6 on upper CI, 3.6 on upper C=P1 (upper CI), 10P (lower CI)=3.6 on lower C and 3.6 on lower CIF=10Q (lower C).
There is a black index line at the left hand end which runs from the upper face of the stock, across the slide onto the lower stock face, which is aligned when the slide is fully inside the stock.
There are also 4 red index lines across the slide at (from left to right) 1Q, 10P, 10Q and P1. When the left hand index line is aligned, the scales align top to bottom as follows at the 4 red index lines : D upper = C upper = CI upper = CI lower = C lower = D lower -
At 1Q : 0.8784 = 1 (1Q) = 3.6 = 1.138 = 3.162 = 2.778
At 10P : 1 = 1.138 = 3.162 = 10 (10P) = 3.6 = 3.162
At 10Q : 2.778 = 3.162 = 1.138 = 3.6 = 10 (10Q) = 8.784
At P1 : 3.162 = 3.6 = 1 (P1) = 3.162 = none = 10
The nominal length from 1Q index to 10Q index is 250mm. The nominal length from 10P index to P1 index is 250mm. The scale length is measured as the complete cycle of the C or D scales at 500mm.
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Construction
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Stock:
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2 part split stock joined with steel springs (DRGM 522689, 1912; DRGM 452965, 1911).
Braced with longitudinal metal strips (DRP 206428, 1908).
Tension adjustment screws in bottom edge (DRP 365637, 1922).
Bevelled top edge, square bottom edge.
High cursor grooves both cut parallel to front face.
Shallow rebate in back .
Front, well, top and bottom edges celluloid faced, secured with wooden pins (DRGM 371190, 1908).
Length x Width x Height (mm) - 385 x 50 x 13
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Slide:
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Single sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Celluliod faced on both sides, rear is inlaid.
Cecured with 4 wooden pins, 2 at each end (DRGM 371190, 1908).
Front face width (mm) - 25
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Cursor:
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Aluminium frame, glass pane.
Square window.
Left end riveted steel spring on top runner.
Three eqidistant full length hairlines, centre black, outer red,
Single short black hairline left of centre for CI sales.
Width x Height (mm) - 50 x 48
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Printing (colours as shown)
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Stock:
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"342" + scales logo + "A.W. FABER" + ""CASTELL"" between lying castles, and "= Columbus =" on the bottom front of the stock in the centre, sans-serif.
"D R PATENT. No 206428 No 365637 D.R.G.M. No 836352 No 1021292/93" on the bottom front rail of the stock toward the left end, sans-serif.
"SYST. ROHRBERG" on the bottom front rail of the stock towards the right end, sans-serif.
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Slide:
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-
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Cursor:
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-
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Labels:
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On back, paper table featuring conversions.
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Instructions
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None
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Box (colours as shown)
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Style:
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Square
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L x W x D mm:
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395 x 63 x 23
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Material:
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Cardboard
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Colour:
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Black
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Construction:
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2 part, internal sleeve join.
Faced.
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Printing:
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scales + "A.W. FABER" ""CASTELL"" logo on front with ",,COLUMBUS''" and then "Syst. Rorhberg" underneath, serif.
Round indentations on the front either side of the opening.
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Labels:
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None seen (ends damaged and taped).
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Detail Images
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Click on the images for enlargements.
Click on the images for enlargements.
Click on the images for enlargements.
Click on the images for enlargements.
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