This apparatus being then arranged, the engineer, after having sent his companions to a distance, filled the hole, so that the nitro-glycerine was on a level with the opening; then he threw a few drops of it on the surface of the rock, above which the mass of iron was already suspended.
Cet appareil fut donc installé; puis l'ingénieur, après avoir fait éloigner ses compagnons, remplit le trou de mine de manière que la nitro-glycérine vînt en affleurer l'ouverture, et il en jeta quelques gouttes à la surface de la roche, au-dessous de la masse de fer déjà suspendue.