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DARGUE Bros. Ltd. / Simplon: S.M.10 Major (Bilateral)

Dargue Brothers Ltd / Simplon S.M.10 Major (Bilateral) Log-Log

Details of: DARGUE Bros. Ltd. / Simplon - S.M.10 Major (Bilateral)

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Keyring, Lilliput or Book) + if needed, qualification to distinguish between versions (e.g. early or late). Log-Log
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 Duplex
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc wood/paper covered by clear plastic
Length? Mostly the linear length of the D scale (in cm or inches) excluding any extensions. For circular/watch slide rules it is the diameter but for helical/tubular/drum slide rules it is the overall scale length. For other calculating aids it is the physical length. 10"
Scales front? Standard (not maker’s) symbols for scales on front face e.g. A = X² (1-100) but § = generic symbol (signum sectiōnis) for any non-standard scale + scales between solidi / / are on the slide(s) whereas scales after vertical line | or after reversed solidus \ are on a straight or bevelled top or bottom side edge LL2,A / B,CI,C / D,LL3
Scales back? Standard (not maker’s) symbols for scales on back face e.g. S = sine (5° to 90° & 85° to 0°) or sin(x) but § = generic symbol (signum sectiōnis) for any non-standard scale + scales between solidi / / are on the back of slide(s) but scales listed after / / - notation are on another surface e.g. back of stock or inside a lid / A,S,T,D / - L,D on back of stock
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus celluloid - 1 hairline
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C4
Date? YYYY for year(s) of production or an approximation/range of years 1940-1960
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc dark-green cardboard case
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed English
Booklet (PDF)? Downloadable .PDF copy of unusual or uncommon model specific instructions download
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

“Half-duplex” layout with scales on back of closed frame stock - chamfered opening used instead of reversible cursor - degree (<5˚34’) Tan & degree (70˚-90˚) Sin look-up tables also on back of non-reversible slide - divisions on 2 & 1 cycle A & D on back of stock run from 0.01-0.1-1.0 & 0.1-1 + table of conversion factors on back - read more ...

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2000/

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
SR-6 Enhanced Mannheim
WR-6 Standard Enhanced Mannheim
WR1-A Selecta Mannheim
XL-10 (Bilateral) Log-Log