A W Faber 309, 51/91/309

(25cm Scale, Enhanced Mannheim, School use)
Examples: 1934, 1938

Version Comparison
Two examples of the model, one from the early numbering system and one from the interim numbering system, fully detailed below, differences summarised as follows:
Click on a column heading to jump down to version images and detailed description.
1934 1938
Front Scale Labels: - A, B, C, D
Slide Rear Scale Labels: S, L, T sin, lg, tg
Decimals: Units Tenths
Cursor Runners: Machined block Folded strip
Origin Labelling: Printed Stamped
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A W Faber 309 (1934)
Image
Image Summary
System: Enhanced Mannheim
Specialization: School use
Type: Closed frame
Material: Pearwood
Facings: Celluliod
Scale Length: 25cm No of Scales: 7
Front Length: 300mm Front Width: 30mm
Language: English Origin: Bavaria
Date: 1934, December
Features/Notes: -
Scales (colours as shown)
Front: A [ B, C ] D Back: [ S, L, T ]
Labels Left: - Labels Left: All, as scales
Labels Right: - Labels Right: All, as scales
Style: Normal Typeface: Sans-serif
Extensions: - Decimals: As units between 1 & 2 on 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 back, upper edge
inch on back, lower edge
Features/Notes: -
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.
Square top and bottom edges.
Double cursor grooves enabling cursor to be turned around and used on the back.
Flat back.
Front, back and well celluloid faced.
Length x Width x Height (mm) - 300 x 30 x 9
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Celluliod faced on both sides
Front face width (mm) - 13.5
Cursor: Freeview (DRP 465658, 1927), glass pane.
Top and bottom aluminium runners machined from block.
Left end riveted steel spring on top runner.
Single central full length hairline.
Width x Height (mm) - 29 x 36
Printing (colours as shown)
Stock: "309" + scales logo + "A.W. FABER" in centre of well above split, sans-serif.
"D.R.G.M." in the centre of the well below the split, sans-serif.
"MADE IN BAVARIA" in the well, above the split towards the right end , sans-serif.
Slide: -
Cursor: "MADE IN BAVARIA" and "1" stamped on the edge of the top runner, sans-serif.
"A.W. FABER." and "D.R.P" stamped on the edge of the bottom runner, sans-serif.
Labels: None
Instructions
None
Box (colours as shown)
Style: Square L x W x D mm: 305 x 45 x 18
Material: Cardboard Colour: Black
Construction: 2 part, internal sleeve join.
Faced.
Printing: scales logo + "A.W. FABER'S" and underneath "Calculating Rule for School use" on the front.
Round indentations on the front either side of the opening.
Labels: "309" and underneath in smaller type "MADE IN BAVARIA" on black, on both ends.
Detail Images
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A W Faber 51/91/309 (1938)
Image
Image Summary
System: Enhanced Mannheim
Specialization: School use
Type: Closed frame
Material: Pearwood
Facings: Celluliod
Scale Length: 25cm No of Scales: 7
Front Length: 300mm Front Width: 30mm
Language: English Origin: Bavaria
Date: 1938, July
Features/Notes: Transitional model numbering system, model continuation from '309'.
Scales (colours as shown)
Front: A [ B, C ] D Back: [ S, L, T ]
Labels Left: All, as scales Labels Left: [ sin, lg, tg ]
Labels Right: All, as scales Labels Right: [ cos, lg, tg ]
Style: Normal Typeface: Sans-serif
Extensions: - Decimals: Tenths between 1 & 2 on 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 back, upper edge
inch on back, lower edge
Features/Notes: -
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.
Square top and bottom edges.
Double cursor grooves enabling cursor to be turned around and used on the back.
Flat back.
Front, back and well celluloid faced.
Length x Width x Height (mm) - 300 x 30 x 9
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Celluliod faced on both sides
Front face width (mm) - 13.5
Cursor: Freeview (DRP 465658, 1927), glass pane.
Top and bottom aluminium runners fromed from folded strip.
Left end riveted steel spring on top runner.
Single central full length hairline.
Width x Height (mm) - 30 x 37
Printing (colours as shown)
Stock: "51/91/309" + scales logo + "A.W. FABER" in centre of well above split, sans-serif.
"D.R.G.M." in the centre of the well below the split, sans-serif.
"MADE IN BAVARIA" stamped in the well, above the split towards the right end , sans-serif.
Slide: -
Cursor: "MADE IN BAVARIA" stamped on the back of the top runner, sans-serif.
Labels: None
Instructions
None
Box (colours as shown)
Style: Square L x W x D mm: 308 x 45 x 17
Material: Cardboard Colour: Black
Construction: 2 part, internal sleeve join.
Faced.
Printing: scales logo + "A.W. FABER'S" and underneath "Calculating Rule for School use" on the front.
Round indentations on the front either side of the opening.
Labels: "51/91" and underneath in smaller type "MADE IN BAVARIA" on black, on both ends.
Detail Images
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