All the simultaneous projections of any one part of the object drawn (fore part or hind part for carriages) must be completely figured; they are accompanied by explanatory inscriptions, with letters of reference to show the names of the pieces in wood or metal which they comprise.
Each collection of sketches must contain as well a notice in confirmation of the drawing, giving the complete description and the properties of the object to which it refers.
The students make two surveys of the same kind; eight days are allowed for each of these surveys, including the composition of the confirmatory notice.
The first survey is followed by the execution of an unfigured drawing, containing a complete representation of the object surveyed (elevation and plan,) obtained by the combination of the partial projections contained in the sketch. The drawing should be colored in the conventional uniform tints, and accompanied by an explanatory inscription, with letters of reference. Ten days are devoted to this work of composition.
V. TRACING OF BATTERIES (4 DAYS.)
This work consists in executing sketches showing, each in accordance with a separate programme, the complete plan of a battery and the essential data having reference to its construction and to its armament. The sketches, made by scale and completely figured, must comprise in the case of each battery to be represented—
1. The general plan of the battery, on the scale of 1/200.
2. The s or elevations necessary for the understanding of this plan, including the detail of the powder magazines, lines of communication, &c., on the scale of 1/100.
3. An inscription giving the object of the battery, its armament, its general arrangement (terre-plein, embrasures, revetment, communications, magazines, &c.,) the workmen, materials, and tools necessary for its construction, and finally the duration of the labor and its distribution by day and night.
Four days are devoted to this work, which must be executed on a half sheet of colombier paper. The separate programmes relating to each of these batteries are shown on the study orders of the rooms.