2 rulers according to Boys made of celluloid
Model 576
Description
2 rulers according to du Bois made of celluloid for the integration of differential equations; to this a trivet and description.
Showcase of this model is Case number U 46
References
Separataband M4 im Mathematischen Institut, On the drawings of curves by their curvature p. 209.
Willers, Tippe(1971). Methoden der praktischen Analysis, 4. verb. Aufl., de Gruyter, Berlin und New York.