The Chief of the Engineer Service will hold 4 “
[FOURTH SECTION.—TRACING OF LINES AND TOPOGRAPHICAL WORK.]
1st. The second reconnaissance survey (comprised in the course of topography.) Tracing of lines; one day is allowed for this work.
2d. “Director” plan. The execution of this plan comprises out-of-door work and drawing. The out-of-door work includes the measurement of one or many bases, the observation of the angles which are formed by this base, and the direction of certain remarkable points in the city and fortification, and the formation of a net-work of triangulation, intended to co-ordinate the surveys of the details.
The work of constructing the plan consists in laying down, day by day, the surveys of the details of the ground, as well as of the traces executed. Five days are allowed for the execution of the topographical work, which precedes the opening of the trenches. The Director Plan is kept close up during the whole duration of the siege.
3d. Itineraries and sketches (comprised in the course of topography.)
The Professor of Topography directs the whole of the surveys and the execution of the Director Plan.
[FIFTH SECTION.—TRACING OF THE WORKS OF ATTACK, AND ACTUAL EXECUTION IN FULL RELIEF OF CERTAIN WORKS.]
The sub-lieutenants, divided into brigades, trace the works of the siege, under the direction of the officers of the staff, and take part in the superintendence of the works executed in full relief when the exigencies of the service will permit the chief of the Artillery Service and the Colonel of the Regiment of Engineers to place workmen at the disposal of the General Commandant of the School. Six days are appropriated to this work.