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Details of: Lawrence Engineering Services - 250-BT OEM

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). DU PONT Enhanced Mannheim
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 wood/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. 25cm
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 A / B,CI,C / D,K
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 / S,L,T /
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus all plastic - 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 1947-1967
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc blue DU PONT pouch
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 tables on back
In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 06-2010/

All of:  Lawrence Engineering Services new search?

10-B blue Enhanced Mannheim without Trig scales
10-B DeLuxe Enhanced Mannheim without Trig scales
10-B DeLuxe Book Enhanced Manheim
10-B OEM LARCH Enhanced Mannheim without Trig scales
10-B OEM GENE LOEWY Enhanced Mannheim without Trig scales
10-B original Enhanced Mannheim without Trig scales
10-B standard Enhanced Mannheim without Trig scales
10-C Engraver's and Photographer's Proportion Calculator
10-D Lumber Calculator - basic version
10-D0 Lumber Calculator
10-F Pricing and Inventory Rule
10-G Cutting Speed Calculator
10-I Model Builder's Slide Rule
10-N Printer's Proportion Rule
12-H Copyfitter printing
12-J Pro-Rater
250-BT Enhanced Mannheim
250-BT OEM US NAVY Enhanced Mannheim
250-BT OEM LIETZ 2974N Enhanced Mannheim
250-BT OEM DU PONT Enhanced Mannheim
250-BT OEM CHARVOZ-ROOS SR31 Enhanced Mannheim
250-V Enhanced Mannheim
6-Op Pocket Flashrule for GE or Westinghouse Photoflash Lamps
6-Op Pocket Calculator for Photoflash Lamps
6-Ow Pocket Flashrule for WABASH Photoflash Lamps
8-A Mannheim
8-B Enhanced Mannheim without Trig scales
8-B OEM DU MONT Enhanced Mannheim without Trig scales
8-B OEM ANCO Enhanced Mannheim without Trig scales
8-L Copper Wire Selector - basic Cedar Valley version
8-L Copper Wire Selector
9-K Music Transposer
B.F. Grizzle Gas Displacement Meter Calculator
B.F. Grizzle Gas Low Pressure Line Flow Capacity Slide Rule
B.F. Grizzle Pipe Flow for gas
B.F. Grizzle Pipe Flow foe water
B.F. Grizzle Pipe Open Flow Capacity
B.F. Grizzle Pipe Orifice Meter Calculating Rule
Canadian Radium & Uranium Gamma-Ray Radiographic
Caprock Concrete Quantity Calculator
Code-Maker Pocket Beich
Code-Maker Pocket (boxed pair)
Code-Maker Pocket Dick Tracy
Fun Incorporated Pocket Poker Meter
Ideas Unlimited Poker Meter
L.E. Waddington Music & Music Acoustics
Madison Cutting Speed Calculator
Miller Motor Air and Hydraulic Cylinder Calculator
MIT Antenna Radar antenna performance
Murphy & Murphy Concrete Quantity Calculator
Pioneer TV coverage calculator
Plaza Express Traffic Manager's
RCA F.M. coverage calculator
Taylor Publishing Copyfitter printing
Tenbrook L.P. Gas
Thomas Music Composition & Transposer
Tokheim 92 K Factor Heating Oil Supply
US Army (DeYOE) Military Artillery Range Finding
US Aviation Underwriters Insurance actuarial