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Lawrence Engineering Services: 250-BT OEM
Details of: Lawrence Engineering Services - 250-BT OEM
| 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. | US NAVY 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 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 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 for any non-standard scale. Scales between solidi (/ /) are on the back of the slide(s). | / 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 | thin metal/plastic - 1 hairline |
| Condition | ? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale | 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 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 & gauge marks 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 | 06-2011/ |
All of: Lawrence Engineering Services new search?
| Model | Type |
|---|---|
| 10-B blue | Enhanced Mannheim without Trig scales |
| 10-B DeLuxe | How To Use It book |
| 10-B DeLuxe | Enhanced Mannheim without Trig scales |
| 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 | DU PONT Enhanced Mannheim |
| 250-BT OEM | US NAVY Enhanced Mannheim |
| 250-BT OEM | CHARVOZ-ROOS SR31 Enhanced Mannheim |
| 250-BT OEM | LIETZ 2974N 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 Low Pressure Line Flow Capacity Slide Rule |
| B.F. Grizzle | Gas Pipe Line |
| B.F. Grizzle | Water Line Capacity |
| B.F. Grizzle | Gas Displacement Meter Calculator |
| 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 Dick Tracy |
| Code-Maker | Pocket (boxed pair) |
| Code-Maker | Pocket Beich |
| 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 & Transposition |
| Tokheim 92 | K Factor fuel oil supply calculator |
| US Army (DeYOE) | Artillery Range Finding |
| US Aviation Underwriters | Insurance actuarial |
