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Unknown: Electroflo

Unknown Electroflo

Details of: Unknown - Electroflo

Type? Usually a generic name preceded by the form if not standard linear length - e.g. Pocket Enhanced Mannheim. For special models often supplemented by its function/use - e.g. meteorology. Sometimes a suffix is needed to distinguish between different versions - e.g. early or late. Boiler effeciency (150-250 lbs/inch) & energy costs
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 wood/paper covered by clear plastic
Length? Mostly length in cm or ” (inches) of the D scale but excluding any scale extensions. But for circular or watch slide rules it is the diameter & for tubular or drum slide rules it is the overall linear scale length. For other mechanical aids it is the physical length. 8"
Scales front? Mostly standardised (not maker’s) symbols for scales on front of stock e.g. A = X² (1-100) but § = generic symbol for any non-standard scale. Scales between solidi (/ /) are on the slide(s) whereas a vertical line ( | ) or reversed solidus ( \ ) + a symbol denotes scale(s) on a straight or bevelled edge. §,§ / §,oF,§,§ / §,%
Scales back? Mostly standardised (not maker’s) symbols for scales on back of stock e.g. S = sine (5° to 90° & 85° to 0°) or sin(x) but § = generic symbol for any non-standard scale. Scales between solidi (/ /) are on the back of the slide(s).
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus simple folded celluloid cursor with circular cut outs.
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C1
Date? YYYY for year(s) of production or an approximation/range of years c1923
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc black "mottled skin" stiff cardboard case
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed Printed on the back: TO OBTAIN DATA NECESSARY TO USE THIS RULE INSTAL ELECTROFLO METERS AND TEMPERATURE MEASURING INSTRUMENTS + 4-page leaflet
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

© H.W. Healy 1923 - form & pinned construction suggests OEM rule by L&C Hardtmuth for London-based Electroflo Meters Co.

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known 05-2011/

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