Dennert & Pape Quadrat QR 41

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Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 54.4 cm,          Width: 4.1 cm,           Weight: 199.5 gms
am Materials: Closed form simplex, PVC body and slide
Cursor: 4.2 X 3.8 X 0.6 cms; metal framed glass lens; lines = 1
Scales: 6, specialized
Front: 50 cms // scale2 [ scale2, scale1 ] scale1 || 1:25 scale.
Back, Slide Back, and Well: blank
Gauge Marks: [      ]
Condition: C4-C5 (Signs of Minimal to Normal use)
Came with: original black cardboard case
Notes: The abbreviaten QR stands for "Quadrat-Rechenschieber", i.e. "Square Slide Rule", and has been used to solve equations of the form

x = sqrt(a^2 + b^2 + c^2 + ..... + n^2).
A (German-language) user manual may be found online. This information was provided by Dr. Detlef Zerfowski, of Steinheim an de Murr, Germany. He maintains an excellent website, here, and has developed the worlds largest bibliography database on mechanical calculation. Many thanks, Dr. Zerfowski!

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