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DARGUE Bros. Ltd / Simplon: SR-3

Dargue Brothers Ltd / Simplon SR-3 Pocket Uniface Technical

Details of: DARGUE Bros. Ltd / Simplon - SR-3

Type? Usually a generic name preceded by the form if not standard linear length - e.g. Pocket Enhanced Mannheim. For special models often supplemented by its function/use - e.g. meteorology. Sometimes a suffix is needed to distinguish between different versions - e.g. early or late. Pocket Uniface Technical
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 \ S,A / B,C / D,T
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 missing
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C5
Date? YYYY for year(s) of production or an approximation/range of years 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

Unusual dirty orange colour plastic = form of bakelite + aluminium strengthening strip on back - “Uniface” type (S & T scales being on front face instead of back of slide) is an innovation others would follow years later

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 08-2018/

All of:  DARGUE Bros. Ltd / Simplon new search?

ModelType
Bilateral Log-Log - early
S.B. 5 Bilateral Pocket Enhanced Mannheim - early
S.B.10 Bilateral Log-Log
S.E.10 (Bilateral) Electro
S.M.10 Major (Bilateral) Log-Log
S.P. 5 Primary Pocket Mannheim
S.P.10 Primary Log-Log
S.R.10 Bilateral Rietz
SR-2 Pocket Mannheim
SR-3 Pocket Uniface Technical
SR-5 Uniface Technical
WR-6 Standard Enhanced Mannheim
WR1-A Selecta Mannheim
XL-10 (Bilateral) Log-Log