Object data
wood and brass
length 65 cm × length 106 cm (max.) × width 7.7 cm × width 11 cm (max.)
Petrus van der Loo
Model of a Ladder
The Hague, The Hague, c. 1850
Inscriptions
- inscription, on a rung: No 2
Provenance
...; transferred from the Ministerie van Marine (Department of the Navy), The Hague, to the museum, 1883
Object number: NG-MC-79
Copyright: Public domain
Entry
Patent model of a ladder for threefold usage: it can be used as a single ladder, as an extended ladder or as a shore ladder.1 The extending part, which is to be lifted by hand, has a small wheel at the top of each leg. Two ratchets prevent this part from sliding back. The top of the lower part is fitted with two hinges to which the extending part can be attached; and when the brace at the bottom is subsequently removed, the whole is converted into a shore ladder.
Petrus van der Loo (1806-1864) obtained a five-year patent for his improvements to ladders2 in 1850. His model was shown at the Exposition Universelle of 1855 in Paris.3
Literature
Expositions des produits de l’industrie de toutes les nations, 1855. Catalogue officiel, Paris [1855], p. 381; J.M. Obreen, Catalogus der verzameling modellen van het Departement van Marine, The Hague 1858, nos. 76-81; G. Doorman, Het Nederlandsch octrooiwezen en de techniek der 19de eeuw, The Hague 1947, no. 1845, p. 305; A.A. Lemmers, Techniek op schaal. Modellen en het technologiebeleid van de Marine 1725-1885, Amsterdam 1996, pp. 260, 355
Citation
J. van der Vliet, 2016, 'Petrus van der Loo, Model of a Ladder, The Hague, c. 1850', in J. van der Vliet and A. Lemmers (eds.), Navy Models in the Rijksmuseum, online coll. cat. Amsterdam: hdl.handle.net/10934/RM0001.COLLECT.242804
(accessed 10 November 2024 11:38:51).