Public domain photos

The image shows a black and white drawing of a machine with text written on it. The machine appears to be a hydrometer, with a cylindrical shape and a handle on the side. The text on the paper reads "Hydrometer" and is likely a description of the machine's features.

The image shows a black and white drawing of a machine with text written on it. The machine appears to be a hydrometer, with a cylindrical shape and a handle on the side. The text on the paper reads "Hydrometer" and is likely a description of the machine's features.Open in library