A W Faber "Castell" & A W Faber-Castell 392, 1/92

(25cm Scale, Log Log, Mathematiker)
Examples: 1930, c1952

Version Comparison
Early version from original model numbering and version from middle of final model numbering system, fully detailed below, differences summarised as follows:
Click on a column heading to jump down to version images and detailed description.
1930 195?
Brand: A W Faber "Castell" A W Faber-Castell
Model 392 1/92
Material: Pearwood Beech laminate
Front Length: 305mm 300mm
Front Width: 35mm 32mm
Red Scales: - CI
Red Numbering: CI CI, cos, ctg
Scale Extensions: Black Red
Left Back Slide Scale Labels: S, L, T sin, lg, tan
Right Back Slide Scale Labels: S, L, T cos, lg, ctg (in red except lg)
p Gauge Mark: A, B, C & D A, B, CI, C & D
r" & r' Gauge Marks: - C & D
Celluliod Facing: Wooden pins -
Slide Width: 14.5mm 14mm
Cursor Form: Aluminium/glass Plastic, two piece
Brand & Model: Well, centre, above split Well, centre, below split
"Castell" Labelling: - vertical, slide, left end
DRP Labelling: Well, centre, below split -
Origin Labelling: - Well, right, below split
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A W Faber "Castell" 392 (1930)
Image
Image Summary
System: Mathematiker
Specialization: -
Type: Closed frame
Material: Pearwood
Facings: Celluliod
Scale Length: 25cm No of Scales: 11
Front Length: 305mm Front Width: 35mm
Language: German Origin: -
Date: 1930, October
Features/Notes: -
Scales (colours as shown)
Front: LL2, A [ B, CI, C ] D, LL3 | K Back: [ S, L, T ]
Labels Left: - Labels Left: All, as scales
Labels Right: - Labels Right: All, as scales
Style: Railway track Typeface: Sans-serif
Extensions: A, B, CI, C & D beyond 1 & 10 Decimals: As units between 1 & 2 on CI, C & D
Gauge Marks: p (3.14) on A, B, C & D
M (1/p=0.318) on A & B
C (1.13) on C
C1 (3.57) on C
Rulers: cm on top edge
Features/Notes: Numbers on CI scale printed in red.
Construction
Stock: 2 part split stock joined with steel springs (DRGM 522689, 1912; DRGM 452965, 1911).
Braced with longitudinal metal strips (DRP 206428, 1908).
Left and right viewing cutouts with index marks, in back for reverse of slide.
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) - 305 x 41 x 11
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Celluliod faced on both sides, secured with wooden pins (DRGM 371190, 1908)
Front face width (mm) - 14.5
Cursor: Aluminium frame, glass pane.
Tab on bottom runner with index for K scale.
Square window.
Left end riveted steel spring on top runner.
Three eqidistant full length hairlines.
Width x Height (mm) - 41 x 39
Printing (colours as shown)
Stock: "392" + scales logo + "A.W.FABER" + ""CASTELL"" between lying castles in the centre of well above the split, sans-serif.
"D.R. PATENT. No 206428." in the centre of well below the split, sans-serif.
"Adrian Brugger, München", presumably the retailer, in the centre the top of the back, sans-serif.
"Quot. +1" and "Prod. -1" on the left and right ends respectively of the front lower stock rail, sans-serif.
Slide: -
Cursor: Scales logo + "A.W.FABER." + "D.R.P.ang." stamped on the lower edge.
"q" stamped on the front of the top runner above the left and centre hairlines.
"d" stamped on the edge of the bottom runner below the centre and right hairlines.
Labels: On back, paper table featuring conversions and mathematical and physical constants.
Instructions
None
Box (colours as shown)
Style: Not present L x W x D mm: -
Material: - Colour: -
Construction: -
Printing: -
Labels: -
Detail Images
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A W Faber-Castell 1/92 (c1952)
Image
Image Summary
System: Log Log
Specialization: -
Type: Closed frame
Material: Beech laminate
Facings: Celluliod
Scale Length: 25cm No of Scales: 11
Front Length: 300mm Front Width: 32mm
Language: English Origin: Germany
Date: c1952
Features/Notes: Model numbering continuation from '392' and '1/92/392'.
Scales (colours as shown)
Front: LL2, A [ B, CI, C ] D, LL3 | K Back: [ S, L, T ]
Labels Left: - Labels Left: [ sin, lg, tg ]
Labels Right: - Labels Right: cos, lg, ctg
Style: Railway track Typeface: Sans-serif
Extensions: A, B, CI, C & D beyond 1 & 10 Decimals: Tenths between 1 & 2 on CI, C & D
Gauge Marks: p (3.14) on A, B, CI, C & D
M (1/p=0.318) on A & B
C (1.13) on C
C1 (3.57) on C
r" (2063) on C & D
r' (3438) on C & D
Rulers: inch on top edge
Features/Notes: cos numbers are printed in red on S.
ctg numbers are printed in red on T.
Construction
Stock: 2 part split stock joined with steel springs (DRGM 522689, 1912; DRGM 452965, 1911).
Braced with longitudinal metal strips (DRP 206428, 1908).
Left and right viewing cutouts with index marks, in back for reverse of slide.
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.
Length x Width x Height (mm) - 300 x 39 x 11
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Celluliod faced on both sides
Front face width (mm) - 14
Cursor: Single piece moulded plastic runners and front pane.
Additional plastic pane for the bottom edge scales at a right angle to fit to the stock, attached to runner with 2 screws.
Left end riveted steel spring on top runner.
Three eqidistant full length hairlines.
Centre hairline continues onto bottom edge pane.
Width x Height (mm) - 43 x 44
Printing (colours as shown)
Stock: scales logo + "A.W. FABER" + "CASTELL" between lying castles + "1/92" in the centre of the well below the split, sans-serif.
"MADE IN GERMANY" in the well below the split towards the right end, sans-serif.
Slide: "CASTELL" vertically at the left end.
Cursor: -
Labels: On back, paper table featuring conversions and mathematical and physical constants.
Title - "Copyright", scales logo + "AW FABER-CASTELL", "STEIN bie Nuremburg"
Instructions
None but instruction from a 1963 1/92 are here.
Box (colours as shown)
Style: Not present L x W x D mm: -
Material: - Colour: -
Construction: -
Printing: -
Labels: -
Detail Images
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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