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

LOGA Calculator A.G.: K150d

LOGA K150d Pocket Technical/Business Rietz-like

Details of: LOGA Calculator A.G. - K150d

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). Pocket Technical/Business Rietz-like
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 Duplex
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc aliminium/cardboard
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. 15cm
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 D / B,CI,% / D
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 K,A / B,CI,C / D,L
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus duplex celluloid wrap around - 3 hairlines front & back
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C4
Date? YYYY for year(s) of production or an approximation/range of years 1910-1920
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc old style LOGA logo in well on front - image courtesy of Nico Smallenburg
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

Model prefix “K” = Kaufmann/merchant & suffix “d” = Duits/German version + unusually separate slide for each side of closed frame i.e. front (yellow slide) for business use & back (green slide) for technical use + many currency gauge points on front face/cursor + adjoined CI/% = ½ length scales + table of gauge points abbreviations in front well + table of constants in well on back ​- see also bigger sibling

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2010/

All of:  LOGA Calculator A.G. new search?

ModelType
15m (ver. E) Desktop Basic long-scale
2.4m (ver. E) Desktop Basic long-scale - yellow
30E (ver. 2) Basic
30RC (ver. 2) Business
30RZh Retail/Conversion
30sR (ver. 2) Basic+
30sT (ver. 1) Technical
30Tt/360º Technical
30Tt/360º Technical - early
7.5m (ver. E) Desktop Basic long-scale - white
75 Praezision 6400 A 0/00 Desktop Military Artillery/Stadia Topography
75E Desktop Basic long-scale
75EA Desktop Basic/Monetary/Conversion long-scale
75RZ (ver. 2) Desktop Retail/Conversion long-scale
75T Desktop Technical long-scale
K150d Pocket Technical/Business Rietz-like
K300d Technical/Business
Topo 6400 A 0/00 (ver. 2) Military Artillery/Stadia Topography - early
Topo 6400 A 0/00 (ver. 3) Military Artillery/Stadia Topography
Wetter (30E) Basic