Germany, unpublished, ca. 1895. Oblong folio (33.0 x 50.2 cm). 36 leaves with numerous original drawings of geometric constructions in black, red, and blue ink. Contemporary blind half linen over marbled boards. Gilt title and author's name on the front board. Pictorial, early Jugendstil endpapers.

A unique album, with gradually more complex geometrical drawings of 2D and 3D objects, together forming a course in mathematical projection. All plates are numbered, and signed "Richard Müller M.1 A b.", or "M.1 A b.". A mathematician, Richard Gottfried Karl Müller (1862-1943) published his thesis Über eine gewisse Gleichung 2n-ten Grades, deren Specialfälle n=2 und n=3 beim Normalenproblem der Ellipse und des Ellipsoides auftreten in Berlin, in 1884. From 1892 to 1906, this Müller was a private lecturer in differential and integral calculus and pure mathematics at Department V (from 1894 Department VI) for general sciences, especially mathematics and natural sciences, at the Königlichen Technischen Hochschule in Berlin. As this album deals with similar issues, we are convinced that this work belonged to him. At any rate, the drawings are of a very high quality, each illustration flawlessly executed, and much care has been taken to add more value by using an individually marked cover. Plates 17 and 18 erroneously numbered 18 and 17 (18 precedes 17, but the latter, arguably, shows more complex projections). Some wear to board ends, and a bit more to the spine foot; the inner joints weak due to the comparatively heavy book block. Otherwise, very good, clean, unmarked and unique item.