A W Faber "Castell" 379

(12.5cm Scale Pocket rule, Electro)

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A W Faber "Castell" 379 (1922)
Image
Image Summary
System: Electro
Specialization: Electrical & Mechanical Engineers
Type: Closed frame
Material: Pearwood
Facings: Celluliod
Scale Length: 12.5cm No of Scales: 11
Front Length: 156mm Front Width: 27.5mm
Language: German Origin: -
Date: 1922, November
Features/Notes: Pocket rule
Scales (colours as shown)
Front: LL2, A [ B, C ] D, LL3 Back: [ S, L, T ]
Labels Left: - Labels Left: -
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, 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 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) - 156 x 34 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) - 145 x 10.5
Cursor: Aluminium frame, glass pane.
Square window.
Centre riveted steel spring on top runner.
Single central full length hairline.
Width x Height (mm) - 29 x 32
Printing (colours as shown)
Stock: "379 * A.W. FABER" and then ""CASTELL"" between two lying castles in the well on the right below the split, 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
None
Box (colours as shown)
Style: Travel case L x W x D mm: 167 x 45 x 20
Material: Leather Colour: Brown
Construction: Fold over flap.
Possibly originally with belt loop on the back.
Printing: None
Labels: None
Detail Images
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Click on the images for enlargements.
Click on the images for enlargements.
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