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You searched for: Dennert & Pape (D&P) | |||||
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Model | Type | Material | Comments | Thumbnail | |
14 | Electro | wood/celluloid veneers | cm scale in well + 3 adjustment screw in bottom side edge |
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D 2/28 | Enhanced Mannheim - early | wood/celluloid veneers | Railway track scales + cm scale & D&P D.R.P. no. 126499 in well & 3 adjustment screws in bottom side edge +- conversion table & 2 open windows on back |
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D 2/28 | Enhanced Mannheim - short | wood/celluloid veneers | Short stock length (possibly because shortage of raw materials) with railway track scales + cm scale & D&P Altona & “Patent” in well of stock - conversion table + 2 open windows on back |
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D 9/28 | Rietz | wood/celluloid veneers | 3 adjustment screws on bottom side edge - conversion tables on back |
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DUPA D14.15 | Pocket Electro | wood/celluloid veneers | Company NAW & model details in well & 2 adjustment screws in the bottom side edge + table of conversion factors on back |
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DUPA Line Loss & Voltage Drop Calculator | Electro poly-slide (2) | wood/celluloid veneers | 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 .... |
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DUPA S.90 | Rietz | wood/celluloid veneers | Possibly an early special commission for H. Linke - PERTODO = D&P trademark for free-view cursor (they wanted RERTOTO from the Latin word “totus” but had to change to PERTODO) - 4 adjustment screws on bottom side edge - conversion tables on back |
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GWR | Desktop Military Naval Artillery | plastic | Instruments for German armed forces during WWII used codes to hide maker’s identity - gwr = D&P + besides solving normal artillery-related distance problems, this naval version also takes into account drift of a moving vessel |
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I | Enhanced Mannheim | wood/celluloid veneers | Table of conversion factors on back |
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I | Lilliput Enhanced Mannheim | wood/celluloid veneers | D&P in well + Inch & cm scales on back |
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I | Pocket Enhanced Mannheim | wood/celluloid veneers | cm scale & D&P & D.R.P. No. 126499 in well of stock |
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I | Pocket Enhanced Mannheim - early | wood/celluloid veneers | D.R.P. No. 126499 in well of stock + inch & cm scales on back |
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IV | Desktop Enhanced Mannheim | wood/celluloid veneers | IV = model with 4 adjustment screws in bottom edge - railway track scales - cm scale in well of stock |
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Präzisions-Kubus-Rechenstab | Squaring long-scale | wood/celluloid veneers | Uncommon & unusual model with just root & trig scales (all long scales) - one open window with cursor line in back on right |
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QR 41 | Desktop Military Artillery Squaring | plastic | QR = “Quadrat-Rechenschieber” - commissioned by “Gebr. Wichmann” (stamp in well) - probably classroom training aid for anti-aircraft gunners - layout consists of two pairs (upper set 0 - 50 & lower set 0 - 15.8) of non-logarithmic independent root scales (no interaction) derived from a set of tables by German Peter Timpenfeld & first published in 1888 - non-conventional use of a cursor purely for positional summing of the squared values |
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S 6/28 (System Rietz) | Rietz | wood/celluloid veneers | DRP No. 126499 in well of stock & 3 adjustment screws in bottom side edge + conversion tables on back + 1 cursor window |