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Electro-Ballistic-Apparatus invented by Major Navez and Colonel Leurs from the Belgium artillery and made by Joseph Jaspar (electricien and industrial -Ateliers Jaspar-, 1823-1899) in Liège, before 1860.
For measuring the speed of projectiles (round shots, musket balls, mortar shells)
included is a recent french copy of the 1859 bookwork, INSTRUCTION sur L'APPAREIL ÉLECTRO-BALLISTIQUE (190 pages) and a copy from the 1860 translation in english by lieutenant-colonel C.W. Younghusband of the Royal Artillery (61 pages).
in good working condition (ca. 3 Volt).
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