Interested in finding out more out about such calculating wonders?
Then try one of the slide rule related articles (often light-hearted) I have published.
Go to the search papers page.
|You searched for: Dennert & Pape|
|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 botton side edge - conversion tables on back
|GWR||Desktop Military Naval Artillery||plastic||
Instruments for German armed forces 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
|I||Enhanced Mannheim||wood/celluloid veneers||
Railway track scales + cm scale & D&P Altona & “Patent” in well of stock - conversion table on back
|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
|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
|System Rietz||Rietz||wood/celluloid veneers||
DRP No. 126499 in well of stock + conversion tables on back
|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 a higher grade of cable than really needed
|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