Interesting tidbit - pointed out by one of my guys.
He was looking through "Budo: Teachings of the Founder of Aikido" (the John Stevens translation), and mentioned that he couldn't find any mention of "Elbow Power".
So I looked through the original Japanese and sure enough there was:
"49. Elbow Power Development"
The translation in "Budo: Teachings of the Founder of Aikido":
"49. Developing Arm Power"