he knew because he was an engineer . Well I am an engineer too. I run my trains around the Christmas tree every year.
So there.
I have several people tell me that they are an engineer or were related to one or knew one, bla bla bla. You would need to be an electrical engineer for this topic as even a structural engineer would not be qualified to intelligently argue this one. A structural engineer will not put his legal stamp on that kind of statement for which he could be held legally responsible.