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Type | ? Where possible the generic name preceded by the form if not 25cm/10” linear - e.g. Pocket Enhanced Mannheim. For specialty types, often supplemented by its use. Sometimes a suffix is also added to distinguish between versions of the same model. | Children's Multiplication Table Teaching Aid/Pencil Case |
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Sort | ? L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. the rest) | T |

Construction | ? Basic construction form of the body i.e. Closed/solid frame or Open frame or Duplex or Other | Other |

Material | ? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc | metal |

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. | 9" |

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. | inch |

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 | none - not needed |

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 | 1920s |

Extras | ? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc | |

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 | Invented & patented (GB167699) as a teaching aid for 1 - 20 multiplication tables by Percy Darnley & Barnett Richards in 1920 - possibly inspired by earlier 1885 German patent (DE33155) of Peter Wiesenmüller - a dark-blue version was also made + German 4-colour series branded ROKA |

In-Out | ? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known | <2005 |

Model | Type |
---|---|

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(NoName) | Desktop Steel Weight Calculator - imperial |

(NoName) | Desktop Poly-slide (2) Steel Bars & Sections Weight Calculator - imperial |

(NoName) | Desktop Gunter Rule |

(NoName) | Half Gunter Rule |

(NoName) | Gaugung Diagonal Line Rod |

B.F. Grizzle | Water Line Capacity |

Balkenschuif | Wooden Floor & Ceiling Beams |

Carpenter | Pocket Joint 4-fold Old Arched-hinged Coggeshall |

Carpenter Timber | Joint 2-fold Large Plate-hinged Coggeshall |

Darnley's Rotable Lightning Calculator | Children's Multiplication Table Teaching Aid/Pencil Case |

Electroflo | Boiler effeciency (150-250 lbs/inch) & energy costs |

Flexider Benelux | Pipe Expansion poly-slide (2) |

MAGIC - BRAIN CALCULATOR | Slide Adder - silver/red |

Noel-Bentley | Desktop Paper Roll Computor poly-slide (2) |

RG-44 | Demonstration Military Artillery Range Finding - System Grigorovich |

Smarty Cat | Child's Teaching Aid/Calculator for Simple Arithmetic |

Twaddell | Strength of liquids |