KØBKE, C. Förste Afhandlung Om at indrette en Artillerie Mathstab og hvorledes man skal benytte af samme [incipit]. [Copenhagen, Naval Academy, 1823-1825].
Folio. Contemporary half-calf over marbled boards, C. Købke in gilt on red morocco label on front cover; pp.  in Danish longhand with calligraphic chapter headings, all pages ruled in black, about 70 smaller illustrations in ink and watercolour, c. 12 half-page illustrations, 34 full-page and one double page cross section of a ship, all meticulously and beautifully executed; binding a little worn, internally very clean and fresh.
This is the course work handed in by a sea cadet to the teachers at the Royal Danish Naval Academy. Each section has a note and date at the end, signed by the examiner. Every detail of artillery and other fire arms, incendiary bombs, mines, ammunition production and the positioning and operation of mortars and cannons on ships is explained and illustrated. The manuscript deals as well with fortification.
One sekondløjtnant C.B. Købke is recorded to have been inspector of the naval artillery from 1830-33. We can't prove it, but there is a possibility that he might be one of 10 brothers of the eminent Danish painter Christen Købke (1810-1848), whose father was the baker of the large fortress Kastellet outside Copenhagen. The naval cadet certainly had artistic talent, and having grown up on the fortress, it is not unlikely that one of the artist's brothers opted for a military career.