File:Bridges 69.png
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Illustration from 1911 Encyclopædia Britannica, article Bridges.
Original text: Fig. 69 b is the polygon of external forces, and 69 c is half the reciprocal figure. The complete reciprocal figure is shown in fig. 69 a.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:50, 3 November 2006 | | 954 × 1,160 (18 KB) | Laverock~commonswiki | Illustration from 1911 Encyclopædia Britannica, article Bridges. Original text: Fig. 69 ''b'' is the polygon of external forces, and 69 ''c'' is half the reciprocal figure. The complete reciprocal figure is shown in fig. 69 ''a''. {{PD-Britannica}} [[C |
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