The foundations of the firm of J.-B. Tibaut-Desimpelaere were laid in 1851 by J. Desimpelaere.1 His son took over the business under the name J.B. Tibaut-Desimpelaere.1 According to his trade label J.B. Tibaut-Desimpelaere was
Mécanicien de l'Institut Cartographique Militare, de l'Observatoire Royal, de la Ville de l'Administration des Ponts et Chaussées, du Ministere de l'Instruction publique, de l'Ecole spéciale du Génie Civil des Chemins de fer Vicinaux, de l'Etat Indépendant du Congo, etc. etc.1
(Engineer of the Military Cartographic Institute, the Royal Observatory, the City Administration of Bridges and Roads, the Ministry of Education, the Special School of Civil Engineering of Local Railways, the Independent State of the Congo, etc. etc.)
A 1922 trade catalogue states that J.-B. Tibaut-Desimpelaere were "...Opticiens, constructeurs d'instruments de précision..." in Brussels and that, given the date of the catalogue, they have been active at least until 1922.2,3
By the time the Lenoir type level in the collection was made he had his workshop and store at Rue de Laeken 11. In 1917 J. Desimpelaere, had his business and workshop at Rue de Laken 15 and 18 in Brussels, perhaps at the same location as his father.4
Although Tibaut-Desimpelaere were known as instrument makers with their own workshop, it seems that they also were re-sellers as a graphometer with their signature is known of a very general design (see figure 2).5 Of these group of very general instruments unsigned examples exist like the graphometer in my collection and signed ones like one by Ducretet. These instruments however hardly seem to differ from each other, which could be explained if the maker was the same, while the signature was added by the re-seller.
Notes: See the label in the box of the Lenoir type level in he collection.
: Museum voor de Oudere Technieken (museum of the older techniques).
: A sun dial is known dated 1898, see page 15 of Inventory of 73 sun dials in Vlaams-Brabant (Belgium). For 1922 see note 1.
: V.A. Rasquin, Dictionnaire des Constructeurs Belges d'Instruments Scientifiques, des origines à 1914, (Bruxelles, 1996), p.47. With many thanks to F. Sperling for sending me this information.
: The graphometer has been on sale at an auction house, see figure 5 at the graphometer page.
If you have any questions and/or remarks please let me know.
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Ahrend Askania Carl Zeiss Jena Chesterman Doyle & Son Jenoptik Jena Kern Aarau Keuffel & Esser Lerebours SAT-SAGEM Secrétan à Paris Société des Lunetiers Tibaut Desimpelaere Wild Heerbrugg