This is a drawing of a steelyard balance scale with an inset diagram. The image features a detailed depiction of a steelyard, which is an ancient weighing device consisting of a horizontal lever with a fulcrum towards one end. The drawing prominently displays the weighing arm of the steelyard with several hooks hanging on one side. The opposite end of the beam has a calibration marker composed of small incremental lines and numbers indicating scale units for measurement. An inset illustration at the bottom left corner provides additional detail, showing a technical drawing with measurements and a focus on a component of the lever mechanism. The overall presentation is precise and technical, indicating a meticulous approach to illustrating the functional details of the weighing device.