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Blundell Brothers/Rules Ltd. (BRL): 644944 / P5284

Blundell Brothers/Rules Ltd. (BRL) 644944 / P5284

Details of: Blundell Brothers/Rules Ltd. (BRL) - 644944 / P5284

Type? A generic name (e.g. Enhanced Mannheim) or function/use for special models (e.g. Meteorology) as an aid to grouping similar models across makers. If not the “standard” 25cm linear length, proceeded by the form (e.g. Demonstration, Desktop, Pocket, Waistcoat, Lilliput or Book) + suffix when needed to distinguish between different versions (e.g. early or late). Radiac Nuclear Fission Products poly-slide (2)
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 with edge tension adjustment points
Length? Mostly linear length in cm or " (inches) of the D scale excluding any extensions. But for circular/watch slide rules it is the diameter & for tubular/drum slide rules it is the overall linear 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 / §,§ / §,§ / §,§ / §
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 chrome/plastic - 1 hairline
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C2
Date? YYYY for year(s) of production or an approximation/range of years 1960s
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc dark green cardboard box
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed English briefly on back of stock
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

Hazard-Detecting Instruments and Apparatus (6665) for British MoD (99) Stock Number (911-0027) © Admiralty Research Laboratory, UK for calculating external radiation doses + scales on front of slides for air contamination & on the backs for sea water contamination - RADIAC = Radio-Activity Detection, Identification & Computation - read more ….

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2010/

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

ModelType
## Double Sharp Steel Weight Calculator (Model A)
0552-160219 Military Torpedo Bearing Rate (Mark I Model 0)
0552-160221 / P2297 Military 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 (ver. NL) Radiac Nuclear Radiation Calculator No.1 for land
6665-110117 (ver. NL) Radiac Nuclear Radiation Calculator No.1 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