File talk:Prestressed concrete en.svg

Legend for the graphic
There is no explanation for what numbers 1-6 mean. My first look at this graphic seemed to be demonstrating 6 types of prestressing, but past that I couldn't get anywhere. After looking at it for another bit, I conclude that 1-2 demonstrate the logic behind the problem, 3 is the solution, and 4-6 exhibits how the solution works. To improve this to be encyclopedic, I'd like to suggest adding a legend to explain each graphic. With some paraphrasing, I think it should look something like this: Feel free to correct me on this if I'm wrong. D. F. Schmidt (talk) 21:02, 14 December 2015 (UTC)
 * 1) A load (including the beam's own weight) is applied to a straight concrete beam.
 * 2) That load deflects the beam.
 * 3) To counteract this deflection, one or more steel cables or reinforcing steel bars is placed in tension near the bottom of the beam as the concrete is poured.
 * 4) After the concrete is cured, the steel continues to be in tension.
 * 5) Prior to applying the design load, the beam appears to be deformed.
 * 6) Upon applying the design load, the beam returns to the desired shape.