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1527083832Code 4711 Cooke levelBrass telescope topographic level, signed T. Cooke & Sons Ltd London No. 68397 made in the second half of the nineteenth century, in original patina and in excellent condition, fully functional and complete with a goniometric compass at the base and double orthogonal level. Length 28 cm, width 14 cm, height 17 cm.
The Level is an indispensable tool for surveyors. It is used to accurately measure a plane that is really tangential to the surface of the Earth. It is an instrument consisting of a telescope fixed parallel to the level. The merit of having conceived the combination of telescope and level is due to Jonathan Sisson and Thomas Hearth who both worked between 1825 and 1850 to variants of this instrument. The enormous development of railway construction in the first half of the nineteenth century determined the demand for a level that was quick and easy to use.
T. Cooke & Sons was a firm that produced optical optics, founded by Thomas Cooke in 1837; they made the famous refractory telescope produced in 1860 for the London University Observatory. After the founder's death in 1868, his sons continued to work.
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Antique measuring instruments
Code 4711 Cooke level
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