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Servo Calculator Co.: Boonshaft & Fuchs

Servo Calculator Co. Boonshaft & Fuchs

Details of: Servo Calculator Co. - Boonshaft & Fuchs

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). Desktop Control Engineering
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 metal/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. 36cm
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 §,§,§,§,§,§,§,§,§,§,§
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 §,§,§,§,§,§,§,§,§,§,§
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus metal/plastic - two central hairlines
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 1950s
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc brown leather zipped case + "spare" 14 slides + incl. cleaning brush - image courtesy of Otto van Poelje photolab
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed English - courtesy of Richard Smith Hughes
Booklet (PDF)? Downloadable .PDF copy of unusual or uncommon model specific instructions download
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

After preloading 11 of 25 removeable slides the chosen scale layout can "simply" calculate overall amplitude ratio & phase of a multiterm transfer function

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2005/

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ModelType
Boonshaft & Fuchs Desktop Control Engineering