Public domain photos

The image shows a drawing of a machine with a long handle and a long tube, which appears to be a refractometer. The drawing is in black and white and shows the various parts of the machine, such as the handle, the tube, and the end of the tube. The text accompanying the drawing provides further information about the machine.

$The image shows a drawing of a machine with a long handle and a long tube, which appears to be a refractometer. The drawing is in black and white and shows the various parts of the machine, such as the handle, the tube, and the end of the tube. The text accompanying the drawing provides further information about the machine.$ Open in library