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E. Gundlach AG: Diamant-Kalkulator

E. Gundlach AG Diamant-Kalkulator Jewellery Rotary Wheel

Details of: E. Gundlach AG - Diamant-Kalkulator

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). Jewellery Rotary Wheel
Sort? L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. the rest) C
Construction? Basic construction form of the body i.e. Closed/solid frame or Open frame or Duplex or Other Duplex
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc plasticised card/metal
Length? Mostly linear length in cm or " (inches) of the D scale but excluding any extensions. For circular/watch slide rules it is the diameter but for helical/tubular/drum slide rules it is the overall scale length. For other calculating aids it is the physical length. Ø 14cm
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 One window front & back
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C1
Date? YYYY for year(s) of production or an approximation/range of years 1956
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc stiff black paper wallet + introductory letter to accompany promotional gift
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed German on back of wallet & slide chart
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

Slide chart specially commissioned by Hamburg Diamanthandelsgesellschaft Lenzen & Stormer & Amsterdam diamond dealer H.E. Slijper - calculates relationships between: (i) quality of a diamond, (ii) size in carat (weight), (iii) diameter in mm, (iv) price/carat in DM & (v) price/stone (total price) in DM  

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 10-2022/

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ModelType
Diamant-Kalkulator Jewellery Rotary Wheel