Macintyre's X-Ray Film is an 1896 documentary radiography film directed by Scottish medical doctor John Macintyre.
The film shows X-ray images of a frog's knee joint and an X-ray radiograph of an adult's heart and digestive tract (using bismuth as contrast).
Text from the film's title card reads: "First XRay Cinematograph ever taken, shown by Dr. Macintyre at the London Royal Society, 1897."
The title card between the footage of images of the heart and stomach reads: "XRay Photograph of adult, each Picture taken in the 300th part of a second.
A series of these enable us to see a complete cycle of the movements of the heart.