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Blundell Brothers/Rules Ltd. (BRL): E.3

Blundell Brothers/Rules Ltd. (BRL) E.3

Details of: Blundell Brothers/Rules Ltd. (BRL) - E.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. Electro
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? 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. Voltage Drop,A / B,F°,Cos,C / D,Dynamo Motor Efficiency
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 - 2 hairlines
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 of years 1947-1948
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc rigid cardboard dark-green case with BLUNDELL printed on front
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. 299 + tensioning pins - read more ...

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 01-2013/

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

## 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
644944 / P5284 Radiac Nuclear Fission Products poly-slide (2)
6665-110060 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.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 - early
G.2 Enhanced Mannheim without Trig scales
G.5 Enhanced Mannheim
Holophane Illumination Lighting Calculator
Holophane Angle Lighting Calulator
L.4 Log-Log
L.6 Log-Log
Laker Cutting Speed/Feed Calculator
P.8 Pocket Mannheim - late
P.8 Pocket Mannheim
P.8 Pocket Mannheim - early
P1418 Shell-Mex & BP Room Volume Calculator
P1442 Shell-Mex & BP Friction Loss Calculator
P1454 Pipe Flow
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 yarn count conversion aid
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
T.20 Technicians Desktop Log-Log
T.50 Janus Multi Log-Log
U.7 Universal Log-Log