Studied from its original page
Der Kern des Querschnitts, with the Centralellipse
kern (core) of a cross-section · Centralkern · central ellipse (ellipse of inertia) · the middle-third rule, its surviving masonry residue
- Made by
- Karl Culmann
- Year
- 1866
- Field
- Engineering
- Kind
- Computing chart
- Room
- Charts that compute
See the original page — fig. 94, printed p. 182 (archive leaf n225)
Published 1866 (A) and Culmann died in 1881, so life+70 ended in 1951 (B).
The data it needs
xposition · quantitative · lengthyposition · quantitative · lengthweightvalue · quantitative · area (or mass)
Built in 6 steps, as its maker described
§§66–67, pp. 176–180 (kern defined p. 179, its meaning p. 180); §69, pp. 181–188, fig. 94 p. 182; §71, pp. 195–197; §72, Taf. 9
14 other forms share this skeleton
Source
Culmann 1866, Die graphische Statik
Attribution checked against the source