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LOGA Calculator A.G.: Topo 6400 A 0/00 (ver. 2)

LOGA Topo 6400 A 0/00 (ver. 2) Military Artillery/Stadia Topography

Details of: LOGA Calculator A.G. - Topo 6400 A 0/00 (ver. 2)

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). Military Artillery/Stadia Topography - early
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 metal/paper
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. Ø 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 A,D / C,§,§
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 C,S,T,ST
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus front: full-width radial cursor - 1 hairline + back: delta wing - 1 hairline
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 1935-1945
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc metal turning lever moves inner disc on front & cursor on back + brown stitched leather zippered pouch - 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 German briefly on front
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

Serial No. 195 exclusively made for Swiss Army for artillery based azimuth calculations - two inner scales on front calibrated for 6400 A ‰ or NATO Mils (A ‰ = 2 x 3200) + see also larger sibling

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

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