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Dennert & Pape (D&P): DUPA Line Loss & Voltage Drop Calculator

Dennert & Pape DUPA Line Loss & Voltage Drop Calculator Electro

Details of: Dennert & Pape (D&P) - DUPA Line Loss & Voltage Drop Calculator

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). 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 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. 26cm
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 translucent yellow & black duplex - 1 hairline + peripheral hairline & gauge marks
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   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 expense of higher grade of cable when not needed - read more ....

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 (D&P) new search?

ModelType
14 Electro
D 2/28 Enhanced Mannheim - early
D 2/28 Enhanced Mannheim - short
D 2/28 Pocket Enhanced Mannheim - late
D 9/28 Rietz
DUPA D14.15 Pocket Electro
DUPA Line Loss & Voltage Drop Calculator Electro poly-slide (2)
DUPA S.90 Rietz
GWR Desktop Military Naval Artillery
I Enhanced Mannheim
I Lilliput Enhanced Mannheim
I Pocket Enhanced Mannheim
I Pocket Enhanced Mannheim - early
IV Desktop Enhanced Mannheim
Präzisions-Kubus-Rechenstab Squaring long-scale
QR 41 Desktop Military Artillery Squaring
S 6/28 (System Rietz) Rietz