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Dennert & Pape: DUPA Line Loss & Voltage Drop Calculator

Dennert & Pape/DUPA Line Loss & Voltage Drop Calculator Electro

Details of: Dennert & Pape - DUPA Line Loss & Voltage Drop Calculator

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. Electro poly-slide (2)
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 wood/celluloid veneers
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. 26cm
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. / §,§ / §,§ / §
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 translucent yellow & black duplex - 1 hairline + peripheral hairline & gauge marks
Condition? Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale C2
Date? YYYY for year(s) of production or an approximation/range of years 1926
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc black linen covered cardboard case with box marks for J. David & Son + two flyers
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed English
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

Copyrighted & patented (US1560599) by Charles C. Moler in 1925 - special commission for The Potomac Edison Company, Maryland, USA (Moler’s employer) ​- 4 adjustment screws in top side edge - besides preventing voltage flicker on electrical distribution lines it could save money by avoiding a higher grade of cable than really needed

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2015

All of:  Dennert & Pape new search?

ModelType
DUPA Line Loss & Voltage Drop Calculator Electro poly-slide (2)
DUPA S.90 Rietz
GWR Desktop Military Naval Artillery
I Enhanced Mannheim
IV Desktop Enhanced Mannheim
Präzisions-Kubus-Rechenstab Squaring long-scale
QR 41 Desktop Military Artillery Squaring
System Rietz Rietz