This is a sepia-toned photograph of a muscular man, likely from the late 19th or early 20th century, engaged in a physical assessment or demonstration. He is shirtless, revealing well-defined chest and arm muscles. His right arm is extended, and his forearm is being measured or tested with a specialized machine. The machine consists of a metal base with a clamp that secures his forearm. A screw mechanism is visible, suggesting the device is used to measure the circumference or strength of his arm. The man's gaze is directed downwards, focused on the machine or his arm. The background is a plain, light-colored surface. On the right side of the image, there is handwritten text that reads 'PROF. BERNARD 27950'. The photograph has a slightly aged appearance, with some discoloration and imperfections, typical of older prints.