A fruitwood cased compass, Austrian, second quarter of the 19th century,
signed Ioh Dvlnig in Bleidel ,with silvered brass dial and scale, case with brass mounts and needle securing mechanism, 3 3/4in (9.5cm wide
(See illustration on page 86)
Whilst Ioh(ann) Dvlnig may be a signature of a maker, the Webster data base records another instrument with a similar inscription. No instrument maker by this name is known, but it may refer instead to the engineer Johann Dulvig (1802-1873).