Thank you. Charles Rounds, Jr of "Loring: A Trustee's Handbook" cited me to the "Uniform Fiduciary Income and Principal Act" July 26th, 2020 §503, actually uses the term, " (b) A fiduciary may transfer to principal a reasonable amount of the net cash receipts from a principal asset that is subject to depreciation, but may not transfer any amount for depreciation:" which is the only source I have found that actually says, CASH, and even better it says NET!!!. I am easily amused and don't get out much...... Still the words after net cash receipts confuses me further....
