Brass ring dial signed Ioannes : Georgivs : ZECH : ANNO 1699

Brass ring dial signed Ioannes : Georgivs : ZECH : ANNO 1699



diameter 4.5 cm x width 1.5 cm



Country of manufacture


Category: Timekeeping


Brass ring dial signed “Ioannes : Georgivs : ZECH : ANNO 1699“.

The instrument consists of a movable central ring with a small hole (gnomon), the whole moving along a graduated scale of the months of the year (I, F, M, A, M, I, I, A, S, O, N, D). The inner face graduated with a double hour scale 1-8, 4-12 drawn on diagonal lines intersecting declination lines with the inscription « GNOSVI, IFMAMI. » et « .I.A.M. .1699. ». The main ring has a slot to let the light through. The main ring has a clasp and a chain.

Dimensions: ring diameter 4.5 cm x width 1.5 cm

Probably Germany, dated 1699.

Nota: ring dials are an old and rather inaccurate form of sundial. They work by allowing the rays of the Sun to shine through a pinhole onto the hour-lines engraved on the inside face of the opposite side of the ring. The use of the ring dial is given in the book of Nicolas Bion « Traité de la construction et des principaux usages des instruments de mathématiques », Ed. 1752, pp. 275-276 and plate 31, Fig. 7, 8, 9.


– This ring is referenced on the Greenwich Maritime Museum website about another ring attributed to Zech (AST0275, This is the ring that was part of the Harriet Wynter collection.

– A very similar German ring is described in our book on sundials published in 2013 (ref. I19, page 380).

– A very close ring dated 1688 is in the British Museum, see Ward, cat.164.

– Another one, dated 1693, was part of the Mercator collection.

– Similar copies can be found in the Greenwich Museum (notably inv. AST0305)

– and in the Kern collection, vol.3, n°172 (dated 1711).

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FR Galerie Delalande Paris

After 37 years in Le Louvre des Antiquaires, the Delalande gallery moved early June 2015 to 35 rue de Lille, 75007 Paris, on the other side of the Seine River in the well known antic shops area "le Carré Rive Gauche".
Our main specialties are, since 1976, Marine and Scientific instruments, Tobacco and Opium objects, Curiosities and Great Canes.
We participate to international antique fairs (TEFAF Maastricht) and are unique partner of the French Maritime Museum.
Eric Delalande is also Administrator of the French Experts National Company (C.N.E.).
Please visit also our two websites, which are frequently updated: (French) and (English). ----------------------------

La Galerie Delalande s'est installée en juin 2015 au 35 rue de Lille (75007 Paris), au coeur de la capitale dans le "Carré Rive Gauche", après 37 années de présence au Louvre des Antiquaires.
Nous nous sommes orientés, depuis 1976, vers plusieurs spécialités : Marine et Sciences, Objets du tabac et de l'Opium, Cannes de collection et Curiosités.
Nous participons à des salons d'envergure internationale (TEFAF Maastricht) et sommes partenaires exclusifs du Musée National de la Marine.
Eric Delalande est également Administrateur de la Compagnie Nationale des Experts (C.N.E.).
N'hésitez pas à visiter nos deux sites internet fréquemment mis à jour : (Français) and (Anglais).

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