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Blundell Brothers/Rules Ltd. (BRL): L.4

Blundell Brothers/Rules Ltd. (BRL) L.4

Details of: Blundell Brothers/Rules Ltd. (BRL) - L.4

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. 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 Closed/solid frame
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc Bakelite/stove-enamell painted
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. 10"
Scales front? Standard (not maker’s) symbols for scales on front face e.g. A = X² (1-100) but § = generic symbol 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 for any non-standard scale + scales between solid / / 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 chrome/glass - 2 hairlines
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C3
Date? YYYY for year(s) of production or an approximation/range of years 1948-1949
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc wooden hinged box.
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

Conversion table on back - Batch No. 316 - read more ...

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 08-2011/

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

ModelType
## Double Sharp Steel Weight Calculator (Model A)
0552-160219 Bearing Rate (Mark I Model 0)
0552-160221 / P2297 Torpedo Spreading poly-slide (2)
304 Academy Darmstadt
308 Academy Accountant's and Business
310 Pocket Academy Basic
644944 / P5284 Radiac Nuclear Fission Products poly-slide (2)
6665-110060 Radiac Nuclear Radiation Calculator No.1 (NL version for land)
6665-110117 Radiac Nuclear Radiation Calculator No.1 (NL version for land)
6665-99-911-0117/0060 Radiac Nuclear Radiation Calculator No.1
80543 Omega Artillery Mils (MK2)
AG2 Rietz-like
AL6 Log-Log
Blakeborough Valve Sizing
C24 D Cost & Profit Reckoner Retail
E.18 Electricians Electro
E.3 Electro
G.1 Student Enhanced Mannheim without TrIg scales
G.1 (reject) Student Enhanced Mannheim without TrIg scales
G.2 Enhanced Mannheim without Trig scales
G.2 Enhanced Mannheim without TrIg scales - early
G.5 Enhanced Mannheim
Holophane Angle Lighting Calulator
Holophane Illumination Lighting Calculator
L.4 Log-Log
L.6 Log-Log
Laker Cutting Speed/Feed Calculator
P.8 Pocket Mannheim
P.8 Pocket Mannheim - early
P.8 Pocket Mannheim - late
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
Paper Facts & Figures Paper Calculating Rule
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