A W Faber & A W Faber "Castell" 378

(25cm Scale, Electro)
Examples: c1911-13, 1932

Version Comparison
Early and late versions of the model fully detailed below, differences summarised as follows:
Click on a column heading to jump down to version images and detailed description.
c1910-13 1932
Branding: AW Faber AW Faber "Castell"
Material: Boxwood Pearwood
No. of Scales: 11 12
Scales Front: LL2, A [ B, C ] D, LL3 LL2, A [ B, 1, C ] D, LL3
Typeface: Serif Sans-serif
Scale Extensions: - Red
p Gauge Mark: A & B A, B, C & D
C & C1 Gauge Marks: C & D C
28.7 Gauge Mark: A & B -
r"' & r' Gauge Marks: - C & D
W Gauge Mark: - D
R Gauge Mark: - D
W index for LL1 & LL2: C -
A Scale Labelling: "K.W." right end "10 Amp." left end, "KW" right end
B Scale Labelling: "mm2" left end, "H.P." right end "10 Yd. 10000 circ.mil." left end, "HP" right end
Red Scales & Labelling: - Volt Scale
Stock Flex: Celluloid sprung Steel sprung
Slide Springs: In groove -
Width x Height: 37 x 10mm 39 x 11mm
Slide Length: 284mm 288mm
Slide Index Edge Fixing: 1 rivet 2 rivets
Cursor Hairlines: 1 3 (unequal)
Cursor Spring: centre rivet Left rivet
Brand & Model: Front, centre bottom Well, right
"*" or "Scales": * Scales
DRP/DRGM Labelling: Full text, front centre bottom Abbreviated text, well right
Origin Labelling: Front, centre bottom Back, centre bottom
Tracking Nmemonics: Short text -
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A W Faber 378 (c1911-13)
Image
Image Summary
System: Electro
Specialization: Electrical & Mechanical Engineers
Type: Closed frame
Material: Boxwood
Facings: Celluliod
Scale Length: 25cm No of Scales: 11
Front Length: 295mm Front Width: 32mm
Language: English Origin: Bavaria
Date: c1911-13
Features/Notes: -
Scales (colours as shown)
Front: LL2, A [ B, C ] D, LL3 Back: [ S, L, T ]
Labels Left: - Labels Left: All, as scales
Labels Right: - Labels Right: All, as scales
Style: Railway track Typeface: Serif
Extensions: - Decimals: As units between 1 & 2 on C & D
Gauge Marks: p (3.14) on A & B
M (1/p=0.318) on A & B
C (1.13) on C & D
C1 (3.57) on C & D
28.7 on A & B
746 on A & B
W index on C for LL2 & LL3
Rulers: cm on top edge
inch on bottom edge
Features/Notes: "Dynamo"/"Motor n=%" and "Volt" scales, labelled, in the well.
Construction
Stock: 2 part split stock joined with celluloid (DRGM 306107, 1907).
Braced with longitudinal metal strips (DRP 206428, 1908).
Boxwood springs in the well, in the slide groove of the upper rail of the stock (DRGM 98350, 1898).
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) - 295 x 37 x 10
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Aluminium index edge at the left end (DRGM 247514, 1905) secured with one rivet.
Celluliod faced on both sides, secured with wooden pins (DRGM 371190, 1908)
Shorter than stock, front face length x width (mm) - 280 x 11.5
Cursor: Aluminium frame, glass pane.
Square window.
Centre riveted steel spring on top runner (broken).
Single central full length hairline.
Width x Height (mm) - 33 x 35
Printing (colours as shown)
Stock: "378 * A.W. FABER." then underneath "D. R. PATENT. No 206428. D.R.G.M. 371190. and underneath "MADE IN BAVARIA" all centred, in the well at the right end, sans-serif.
"Quot. +1" and "Prod. -1" on the left and right ends respectively of the front lower stock rail, sans-serif.
"K.W." at the right end of the A scale.
Slide: "mm2" & "H.P." at the left and right ends respectively of the B scale.
Cursor: -
Labels: On back, paper table featuring conversions and mathematical and physical constants.
Instructions
Original "Calculating Rule" instructions, illustrations sheet and "FOR ELECTRICAL AND MECHANICAL ENGINEERS" electro instructions, all a little tatty and dirty, the latter being more torn and delicate. These can all be seen here.
Box (colours as shown)
Style: Rounded L x W x D mm: 305 x 50 x 23
Material: Cardboard Colour: Black
Construction: 2 part, internal sleeve join.
Cloth covered.
Metal braced ends.
Printing: "A.W. FABER." and underneath "D.R.P. No 206428" followed by "MADE IN BAVARIA." on the front.
Labels: Large red/green on white advertising label on back.
Possible trace of model number label on right end (ends damaged).
Detail Images
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A W Faber "Castell" 378 (1932)
Image
Image Summary
System: Electro
Specialization: Electrical & Mechanical Engineers
Type: Closed frame
Material: Pearwood
Facings: Celluliod
Scale Length: 25cm No of Scales: 12
Front Length: 295mm Front Width: 32mm
Language: English Origin: Bavaria
Date: 1932, December
Features/Notes: -
Scales (colours as shown)
Front: LL2, A [ B, 1, C ] D, LL3 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, C & D beyond 1 & 10 in red 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
746 on A & B
r" (2063) on C & D
r' (3438) on C & D
W (3.32) on D
R (5.53) on D
Rulers: cm on top edge
inch on bottom edge
Features/Notes: Model 378 electro scale layout (DRGM 379365, 1924).
"Dynamo"/"Motor n=%" scale and "Volt" scale (DRGM 379366, 1924), labelled, in the well. Volt scale numbers and label in red.
Electrical resistance and power load (DRGM 881735, 1924) measured on the A scale.
1 is a short temperature scale on slide close to B scale. Range 32 to 167 between approx. 11.6 and 15.5 of B scale, with additional marks for 59, 68, 77 and 122.
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) - 295 x 39 x 11
Slide: Double sided
Braced with longitudinal metal strips (DRP 206428, 1908)
Aluminium index edge at the left end (DRGM 247514, 1905) secured with two rivets.
Celluliod faced on both sides, secured with wooden pins (DRGM 371190, 1908)
Shorter than stock, front face length x width (mm) - 288 x 12
Cursor: Aluminium frame, glass pane.
Square window.
Left end riveted steel spring on top runner.
Three non-eqidistant full length hairlines.
Width x Height (mm) - 41 x 36
Printing (colours as shown)
Stock: "378" + scales logo + "A.W. FABER" + ""CASTELL"" between lying castles in the well above the split towards the right, sans-serif.
"D.R.P." and "D.R.G.M." in the well below the split towards the right, sans-serif.
"MADE IN BAVARIA." on the bottom centre of the back, sans-serif.
"10 Amp." & "KW" at the left and right ends respectively of the A scale.
Slide: "10 Yd. 10000 circ.mil." & "HP" at the left and right ends respectively of the B scale.
Cursor: "52" stamped on the right end of the top edge, sans-serif.
"MADE IN BAVARIA" stamped on the bottom edge, sans-serif.
"W" stamped on the front of the top runner above the left hairline.
"HP" and "s" stamped on the front of the top runner above the centre hairline.
"d" stamped on the edge of the bottom runner below the right hairline.
Labels: On back, paper table featuring conversions and mathematical and physical constants.
Instructions
None
Box (colours as shown)
Style: Square L x W x D mm: 302 x 48 x 20
Material: Cardboard Colour: Black
Construction: 2 part, internal sleeve join.
Faced.
Printing: "A.W. FABER" and underneath scales logo and "D.R.P." beneath that on the front.
Labels: None seen, box is heavily taped.
Detail Images
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