caption: The image shows a black and white etching of a man standing next to a ruler, with a scale and text at the top. The man is wearing a long coat and a hat, and is holding a staff in one hand and a book in the other. He has a determined expression on his face, and his eyes are focused on something in the distance. The scale is a standard ruler with a black body and white markings, and the text is written in a bold font.