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Dargue Brothers Ltd / Simplon:S.R.2 Sub-Ivory

Dargue Brothers Ltd / Simplon S.R.2 Sub-Ivory Pocket Mannheim

Details of: Dargue Brothers Ltd / Simplon - S.R.2 Sub-Ivory

Type? Where possible the generic name preceded by the form if not 25cm/10” linear - e.g. Pocket Enhanced Mannheim. For specialty types, often supplemented by its use. Sometimes a suffix is also added to distinguish between versions of the same model. Pocket Mannheim
Sort? L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. the rest) L
Construction? Basic construction form of the body i.e. Closed/solid frame or Open frame or Duplex or Other Closed/solid frame
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc plastic/bakelite
Length? Mostly length in cm or ” (inches) of the D scale but excluding any scale extensions. But for circular or watch slide rules it is the diameter & for tubular or drum slide rules it is the overall linear scale length. For other mechanical aids it is the physical length. 5"
Scales front? Mostly standardised (not maker’s) symbols for scales on front of stock e.g. A = X² (1-100) but § = generic symbol for any non-standard scale. Scales between solidi (/ /) are on the slide(s) whereas a vertical line ( | ) or reversed solidus ( \ ) + a symbol denotes scale(s) on a straight or bevelled edge. inch \ A / B,C / D
Scales back? Mostly standardised (not maker’s) symbols for scales on back of stock e.g. S = sine (5° to 90° & 85° to 0°) or sin(x) but § = generic symbol for any non-standard scale. Scales between solidi (/ /) are on the back of the slide(s).
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus chrome/glass - 1 hairline
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C2
Date? YYYY for year(s) of production or an approximation/range 1931-1935
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc original black stiff cardboard slipcase blind-stamped "SIMPLON" SLIDE RULE
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed
Comments ? Any special or noteworthy traits + significant use-related facts + pertinent details of scales/tables in well of stock + any significant tables, etc on the back of the stock

“Sub-ivory” from unusual orange colour plastic (possibly form of bakelite) - Identical to S.R.-1 except this model has studier full-view glass cursor - unusually with original case ​

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 11-2017/

All of:  Dargue Brothers Ltd / Simplon new search?

ModelType
Bilateral Log-Log - early
S.B.10 Bilateral Log-Log
S.B.5 Bilateral Pocket Enhanced Mannheim
S.E.10 (Bilateral) Electro
S.M.10 Major (Bilateral) Log-Log
S.P.10 Primary Log-Log
S.P.5 Primary Pocket Mannheim
S.R.10 Bilateral Rietz
S.R.2 Sub-Ivory Pocket Mannheim
S.R.5 Sub-Ivory Uniface Technical
XL-10 (Bilateral) Log-Log