A practical demonstration of such system can be seen here.
I hadn't made any practical demonstrations to Kelson before today.
He was eager to see the first large-scale practical demonstration of his new shields.
Thirty hours later I got a practical demonstration of what "in imminent" meant.
This was a very practical demonstration of why the Army trained people to be disciplined.
"I was thinking more of a practical demonstration," she said.
I agree, but it's amazing what a difference a little practical demonstration can make.
Always try to give a practical demonstration of how to use the programme.
This challenge is a practical demonstration of wireless power transmission.
He and his mine are the practical demonstration of what could have been done.