Representation of the complex sprue system planned for casting the equestrian monument in one piece. The overlay shows the initial downward direction of the molten metal through the gates (red) and upward movement of displaced air along the vents as the bronze fills the mold (blue). Mariette, Pierre-Jean. 1768. Description des travaux qui ont précédé, accompagné et suivi la fonte en bronze d’un seul jet de la statue équestre de Louis XV, le Bien-Aimé, dressée sur les mémoires de M. Lempereur. Paris: Imprimerie de P. G. Le Mercier. https://archive.org/details/gri_33125010908289/mode/2up., 78, plate II detail, showing Edme Bouchardon (French, 1698–1762), Louis XV, cast in 1758 by Pierre Gor (French, 1720–1773), H. 520 cm. After Desmas, Anne-Lise. 2014. “Boffrand’s and Mariette’s Descriptions of the Casting of Louis XIV and Louis XV on Horseback.” In French Bronze Sculpture: Materials and Techniques 16th–18th Century, edited by David Bourgarit, Jane Bassett, Francesca G. Bewer, Geneviève Bresc-Bautier, Philippe Malgouyres, and Guilhem Scherf, 234–340. Paris: Archetype..