Public domain photos

The image shows an open book with a drawing of a telescope on it. The book is filled with text and lines, and at the bottom of the image there is additional text. The telescope is depicted in the center of the page, with its lens and other details clearly visible.

The image shows an open book with a drawing of a telescope on it. The book is filled with text and lines, and at the bottom of the image there is additional text. The telescope is depicted in the center of the page, with its lens and other details clearly visible.Open in library