Description of a universal graphometer, being a most accurate drawing instrument invented by A.G. Eckhardt. Part I, 1778

Album with text pages and 12 representations on 30 album pages. It concerns the work titled: Description of a general graphometer being a most accurate drawing instrument. The album contains a title page, ten pages with a description of the graphometer and twelve images with on the opposite page a text page with explanation. The representations are drawn using a graphometer (or angle meter). Leather binding with front and back two flyleaves.