Two telescopes from the late 19th or early 20th century: - one with a brass and mahogany print. Signed BERGE, London, late RAMSDEN. Length: 86 cm. - one with three pulls in copper-plated brass and braided black rope. Length: 33 cm. = scratches, some bumps and oxidation from use. ATTACHED : Prototype of a calculating instrument with two circular wooden trays, movable, with a sheet of paper showing a compass rose or a median line, mounted on an axis and on a square plate, with a manual matching needle. Small cardboard box in the lower right-hand corner of the Latin, with brief instructions for use. Late 19th or early 20th century. Stains, some paper missing. Instrument designed by a naval officer to keep a vessel in line with others at a safe distance.