A good oxidised brass theodolite / sighting cross, signed on the drum, Deleuil a Paris. The 7 telescope has push / pull focussing, 7/8th objective, cross hairs to the eye-piece and gives a good clear inverted image, the telescope connected to a brass vernier reading to 15 arc minutes against a 70 degree scale. The drum has cross-hair sights, the top half with a vernier and bottom half with engraved 360 degree scale; the top part of the drum rotates via a thumb wheel. With 2.25 silvered compass dial to the top with jewelled needle, locking bar and bubble levels. All mounted over a three screw tripod attachment with fine thumb wheel adjuster.
11 high and in excellent condition throughout and contained in mahogany case with later trade label for Clarksons Optical Store, London. Louis-Joseph Deleuil was an engineer-optician and scientific instrument maker who founded the Society of Precision Optical Instrument Makers in 1820. He was the inventor of the Deleuil Balance and installed the first electric lighting system in Paris in 1844. He was awarded medals at the Universal Exposition in 1849, 1851 and 1855.
The item "Theodolite / Sighting Cross Deleuil a Paris" is in sale since Sunday, September 6, 2020. This item is in the category "Antiques\Science/Medicine\Scientific Instruments". The seller is "marl727" and is located in Blackpool. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.