The tip of the first cone is touching. As soon as that happens it is no longer giving a reading so how can you know how much higher the temperature has gone? The second one has fallen a little too far. I have the third one positioned on the Orton guide (with the bold line lined up with the bend point). It is just about right. Just another reason why self supporting cones are much better than standard ones.
Devices that melt and bend in a ceramic kiln at specific temperatures. By viewing them through a peephole the operator can tell accurately what temperature the kiln has reached.