The words of newspaper editor Arthur Brisbane to the Syracuse Advertising Men's Club, in March 1911: "Use a picture. It's worth a thousand words."

Ed Lowry, ballistician and the director of research at Olin-Winchester, spark shadowgraphs. See "The Effect of a Shotstring" American Rifleman, November 1979.
I do not have the original, and would be very interested to know if shot speed was also measured