A large etching of Brunings's flow velocity instrument, 1798
Christiaan Brunings. Aftekening van den Stroom-meter tot het nemen der Proeven wegens de Snelheid van den Stroom. 1798. 72,5 x 62,5 cm (plate size: 64,5 x 59,5 cm). Etching, printed on heavy paper stock, engraved by Daniel Veelwaard after a drawing by Frederik Willem Conrad. Folded twice, a small tear, otherwise in good condition.
A surprisingly rare etching of Brunings's flow velocity instrument.
Christiaan Brunings (1736-1805) was the first president of the Directorate-General of Public Works and Water Management (Rijkswaterstaat). "He played an important part in the negotiation between the King of Prussia and important Dutch regional waterboards about the water discharge distribution of the river Rhine. In 1771 these negotiations resulted in one of the first international treaties on water affairs. Within the framework of this treaty on the division of flow discharge over the distributaries of the river Rhine in the Dutch delta, measurements of the actual flow division were needed. Brunings invented a clever instrument to measure flow velocities in great detail" (Hesselink). This print shows Bruning's invention in beautiful detail.
Cf. Hesselink, 'Christiaan Brunings'.