The role of the Polytechnician as state engineer in the making of modern engineering science in France has been well known. This article articulates the role of the civilian engineers and the two engineering schools producing those civilian engineers in the making of typically French engineering tradition, particularly in mechanical engineering. The mechanical engineers from Ecoles des Arts et M$acute{e}$tiers and Ecole Central des Arts et Manufactures played a significant roles in the making of modern engineering sciences through their contributions to the making engineering as a theoretical sciences and to the mediation of the technicians and the managers in mechanical engineering.