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Details of: Aristo - 99 Rietz

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 Rietz
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/simplex
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 two-tone
01070 MultiLog Desktop Technical/Log-Log
0602 Pocket Basic Retail two-tone
0901 Junior Technical two-tone (ver. 2)
0902 JuniorTrig Technical two-tone
0903 LL Scholar Technical/Log-Log two tone (ver. 1)
0903 LL Scholar Technical/Log-Log two tone (ver. 2)
0903 Scholar Rietz-like two tone (ver. 2)
0903 Scholar Rietz-like two tone (ver. 3)
0903 VS Scholar Technical two-tone (ver. 1)
0903 VS-2 Scholar Technical two-tone (ver. 1)
0906 LL BiScholar Technical/Log-Log
0908 TriLog Technical/Log-Log two tone (ver. 1)
0929 MultiRietz Technical two-tone
0929 MultiTrig Technical two-tone
0968 Studio Technical/Log-Log two-tone (ver. 1)
0968 Studio Technical/Log-Log two-tone (ver. 2)
0969 StudioLog Technical/Log-Log two-tone
0970 MultiLog Technical/Log-Log two-tone
0971 HyperboLog Log-Log Hyperbolic
10071 Lighting - System Herbrechtingen
101 Junior Demonstration OHP School/Technical
10181 Pocket Basic
1055 Commerz I Desktop Business
1067 U Darmstadt Desktop Darmstadt
1067 U Darmstadt Desktop Darmstadt
109 Rietz 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
60115 HOHLUX Photography
60126 RADAR-WIND Desktop Military Artillery Range Finding/Meteorology
60147 Waerme- und Dampfpreis-Kalculator Fuel Prices (ver. 4)
60168 Stahlgewichtsrechner Steel Weight Calculator
60190 Gradtag Desktop K Factor Heating Oil Supply
604 Prozent-Rechner Pocket Basic Retail
615 Aviat Aviation
620 Basic
622 Calculator Enhanced Mannheim without Trig scales two-tone
623 Commerz III Business two-tone
670 NSU Pocket Keyring/Time-Speed-Distance Travel Calculator
803 MonoRietz Pocket Rietz two-tone
810 Puck Lilliput Enhanced Rietz-like
812 Simplex Pocket Enhanced Mannheim
815 Elektro Pocket Electro
860 Pocket Darmstadt
867 U Pocket Darmstadt
867 U Pocket Darmstadt - early
868 Studio Pocket Technical/Log-Log two-tone (ver. 1)
868 Studio Pocket Technical/Log-Log two-tone (ver. 2)
89 Pocket Rietz
89 Rietz Pocket Rietz
890 Rietz Pocket Rietz
90107 Lighting
90184 Steel
90192 Textile
911 Simplex Mannheim
914 Elektro Electro
915 Elektro Electro
918 Kanalisation Pipe Flow in sewerage pipes - System Vicari
939 Stahlbeton Reinforced Concrete - System Göttsch
940 Stahlbeton (DIN 1045) Reinforced Concrete - System Göttsch
945 Praktiker Business
956 Bildflug Photography
965 Commerz II Business
968 Studio Technical/Log-Log two-tone (ver. 1)
968 Studio Technical/Log-Log two-tone (ver. 2)
970 MultiLog Technical/Log-Log two-tone
99 Rietz (ver. 1)
99 Rietz (ver. 2)
99 Rietz Demonstration/Display Rietz
99 Rietz Demonstration/Display Rietz - early
M 66 Basic Electronic Calculator
M 85 Scientific Electronic Calculator (ver. 1)