56.8 x 12.5 x 37 Carved and inlaid wood, iron and bras
Adjustable slit mounted on a stand to permit height adjustment
56.8 x 12.5 x 37 Carved and inlaid wood,
iron and bras
's Gravesande, Willem Jacob, Physices Elementa, Leiden, 1742, Vol. II, §2728, Tab. LXXXVI, Figs. 3, 6, 7.