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Blundell Brothers/Rules Ltd. (BRL): 308

Blundell Brothers/Rules Ltd. (BRL) 308

Details of: Blundell Brothers/Rules Ltd. (BRL) - 308

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not the “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Lilliput or Book) & when needed, a suffix to distinguish between versions (e.g. early or late). Academy Accountant's and Business
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 Open frame
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc 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 §,LL1,§ / §,%,C / D,LL3,LL2
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
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus plastic - 1 hairline
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C1
Date? YYYY for year(s) of production or an approximation/range of years 1958-1970
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc blue & clear plastic pouch
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed special leaflet
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

For per-decimalisation £,s,d (UK went decimal 1971)

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 06-2012/

All of:  Blundell Brothers/Rules Ltd. (BRL) new search?

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304 Academy Darmstadt
308 Academy Accountant's and Business
310 Pocket Academy Basic
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AL6 Log-Log
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E.18 Electricians Electro
E.3 Electro
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G.2 Enhanced Mannheim without TrIg scales - early
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L.4 Log-Log
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P.8 Pocket Mannheim - early
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P1409 Holophane Illumination Calculator
P1418 Shell-Mex & BP Room Volume Calculator
P1442 Shell-Mex & BP Friction Loss Calculator
P1454 Pipe Flow
P1470 Conversion
P1553 Armstrong Calculator for Flooring
P17 Log-Log
P1732/A Fisher Valve Sizing Mark III F
P1960/B Paint Calculator (folded £-s-d scale)
P2245 Textile
P2304 Paper Substance Calculator
P2327 (P4409) Percentage Overlap on Metal Seams
P2808 Ultrasonic poly-slide (2) for testing metal buttt welds
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S.101 Pocket Rietz-like
T.12 Technicians Log-Log
T.20 Technicians Desktop Log-Log
T.50 Janus Multi Log-Log
U.7 Universal Log-Log