698. VIOLLET (J. B.). Essai pratique sur l'établissement et le contentieux des usines hydrauliques. Paris, Carilian-Goeury, 1840, XX-306 pp.-LXXIV pp. in-8, green half-basin, smooth spine decorated with gilt fillets (period binding). followed by : Notice sur l'exactitude et l'usage du frein dynamométrique pour la mesure de la puissance des usines. Paris. Carilian-Goeury, 1839, 55 pp. followed by: Théorie des puits artésiens, Paris. Carilian-Goeury. 1840. [5] ff ; XLVIII-238 pp. ; [2] ff. First editions, illustrated with 11 out-of-text folding plates, including 2 flyers. This collection of three texts concerns hydraulics and artesian wells. Stamps of the Léon Dru library and the library of the Paulin et René Arrault drilling company. Leaves 39-42 detached. Some foxing. Spine a little rubbed.