More about Deltas, Shoulders and Loops

There are a few other rules to remember about Deltas:

• The delta may not be located at a bifurcation which does not open toward the core
• When there is a choice between a bifurcation and another type of delta, the bifurcation is sleected
• When there are 2 or more possible deltas which conform to the definition, the one nearest the core is chosen
• The delta may not be located in the middle of a ridge running between the type lines toward the core, but at the nearer end only
• The core is placed upon or within the innermost sufficient recurve
• When the innermost sufficient recurve contains no ending ridge or rod rising as high as the shoulders of the loop, the core is placed on the shoulder of the loop farther from the delta
• When the innermost sufficient rucurve contains an uneven number of rods rising as high as the shoulders, the core is placed uponi the end of the center rod whether it touches the looping ridge or not
• When the innermost sufficient recurve contains an even number of rods rising as high as the shoulders, the core is palced upon the end of the farther on eof the 2 center rods, the 2 center rods being treated as though they were connected by a recurving ridge. 

The shoulders of a loop are the points at which the recurving ridge definitively turns inward or curves

The recurve must have no appendage abutting it at a right angle between the shoulders an on the outside. If it does, then the loop is considered spoiled and the next loop outside will be considered to locate the core.