• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
  • support@email.com

Details of: DIWA (Dansk Industri Waterpas A/S ) - 601

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not the “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Lilliput or Book) & when needed, a suffix to distinguish between versions (e.g. early or late). Pocket Promotional 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 Closed/solid frame
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. 12½cm
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,S&T,T /
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus all plastic - 1 hairline
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C0
Date? YYYY for year(s) of production or an approximation/range of years 1960-1979
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc dark-blue stitched leather comb case with SIPOREX name in gold + dark-blue stiff cardboard box
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed Danish in box
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

Version of 621 but primarily a model for a promotional slide rule - in this case for Danish supplier of light-weight concrete SIPOREX + company details on back with 1 cursor window

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:  DIWA (Dansk Industri Waterpas A/S ) new search?

ModelType
1-1 Rietz-Ideal Rietz
101 Log Log Log-Log
201 Technical (ver.1) Rietz
201 Technical (ver.2) Rietz
301 Commercial Enhanced Mannheim
301 Rietz Rietz
501 Rietz Rietz
551 Darmstadt
601 Pocket Promotional Rietz
601-1 Pocket Rietz
611 Pocket Electro
621 Technical Pocket Rietz
631 Commercial Pocket Enhanced Mannheim
701 Rietz
710 Teknilog Technical
741 Businessman Export Technical two-tone