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Details of: Aristo - 99

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Keyring, Lilliput or Book) + if needed, qualification to distinguish between versions (e.g. early or late). Demonstration/Display Darmstadt
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 Other
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc plastic
Length? Mostly the linear length of the D scale (in cm or inches) 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. 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 cm \ K,A / B,CI,C / D,L
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,ST,T /
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus free-view all plastic - 1 hairline + 2 peripheral hairlines
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C5
Date? YYYY for year(s) of production or an approximation/range of years 1965
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

100% Geretsried made dummy - slide does not slide - “Ausstellugsmuster” on back

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2000/

All of:  Aristo new search?

ModelType
01068 Studio Desktop Technical/Log-Log
01070 MultiLog Desktop Technical/Log-Log
101 Junior Demonstration OHP School/Technical
1055 Desktop Commerz I Business
1067 U (D&P) Desktop Darmstadt
1067 U Desktop Darmstadt
109 (D&P) Desktop Rietz
168 Studio Demonstration OHP Technical/Log-Log
206/1&2 BiScholar Demonstration School 35mm Slide Projection Set
30050 Lindell "55" Desktop Transversal Planimeter
301 Junior Demonstration School/Technical
303 LL Scholar Demonstration School/Log-Log
60126 RADAR-WIND Desktop Military Artillery Range Finding/Meteorology
670 NSU Pocket Keyring/Time-Speed-Distance Travel Calculator
939 Reinforced Concrete - System Göttsch
99 Demonstration/Display Darmstadt
99 Demonstration/Display Darmstadt - early