What exactly did Thomas Edison say about the theory of relativity?

Need some scholarly help here.  I worry that what I want isn’t available in print, and perhaps not at all on the internet.

Thomas Edison at 80, in 1927; from Edison After 40: Edison’s career coincided with the widespread use of photography. During his lifetime he sat several times for professional portrait photographers. In addition, most of the time there was a photographer at the laboratory, recording the historic course of events.

Remember the old “Garry Moore Show?”  In the farming and  not-quite-suburban towns where I spent my first 18 years, Garry  Moore was a popular guy.  Today he might be remembered as the variety show host who pushed to get Carol Burnett on television, and helped her early career.  In his own right, he was a television staple — MC for daytime quiz shows, night-time quiz shows, and a couple of variety programs that entertained those of us living in what was then the greater American community, but is today too often mislabeled as “fly-over land.”

Garry Moore, Carol Burnett, and Durward Kirby, in a publicity still photo from 1961’s “Garry Moore Show.” Wikipedia

In one of his variety programs (probably called “The Garry Moore Show”) he featured a weekly pirouette through history using old photos and old films, “That Wonderful, Wonderful Year.”  In that time before home VCRs, historical films were difficult and expensive to come by (some still are).  These vignette and skit views into history were often unique.  Hey, it was an entertainment show.

(That’s a long set-up.)

One of those history romps featured a film interview with Thomas Edison, in his 80s.  I recall it was on the event of Edison’s 86th birthday, but don’t hold me to that — especially since he didn’t live to 86 (1847-1931; this is a demonstration of the faults of memory, especially mine).

The interviewer asked Edison, the inventor and practical applicator of chemistry and physics, what he thought of new science, specifically, Albert Einstein’s theory of relativity.  Edison’s answer was direct, honest and startling — so much so that I wrote it down on a long-lost notepad.

‘I don’t think anything of Einstein’s theory of relativity,’ Edison said, ‘because I don’t understand it.’

Can you help me track down exactly what Edison said about relativity, and where and when?