To make profits using technical analysis? That's what Warren Buffett used to do

He was hooked on share trading at this time. He tried all sorts of ways to make share trading work, from chart patterns to numerical patterns and 'odd-lot stock trading,' whatever that was. We can tell from this that Buffett had been speculating."
—— Glen Arnold's book, "The Deals of Warren Buffett, Volume 1: The First $100m,"

In the late seventies, he bought a few stocks for his own account. He was a bit more of a swinger with his personal money. For instance, in the case of Teledyne, Buffett invested in options — a strategy with a higher chance of either failing or making a killing. According to one associate, he also bought copper futures — an outright speculation.
—— "Buffett: The Making of an American Capitalist, Chapter 12" by Roger Lowenstein

If I were on a desert island and allowed just one investment tool, it would be the chart.”
—— Bolton said