File:Elektromagnetisch apparaat en een theodoliet op de Great Exhibition of the Works of Industry of All Nations van 1851 in Londen Electro-Magnetic Apparatus and Theodolite. Froment (titel op object), RP-F-F25213-AD.jpg
![File:Elektromagnetisch apparaat en een theodoliet op de Great Exhibition of the Works of Industry of All Nations van 1851 in Londen Electro-Magnetic Apparatus and Theodolite. Froment (titel op object), RP-F-F25213-AD.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/81/Elektromagnetisch_apparaat_en_een_theodoliet_op_de_Great_Exhibition_of_the_Works_of_Industry_of_All_Nations_van_1851_in_Londen_Electro-Magnetic_Apparatus_and_Theodolite._Froment_%28titel_op_object%29%2C_RP-F-F25213-AD.jpg/738px-thumbnail.jpg?20191229180424)
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