[The description fi the stage-set machinery of] the theatre of the Opé ra de Paris is spread over 13-in-depth plans; all of the traps are 2ft 11in wide each from one truss to the other; the four trusses containing the three trapdoors, are of 2ft 2in from exterior to exterior; thus, one trap and the four trusses are 5ft 1in from the front of one frame to the other.

The opening on the first frame is 17ft from the middle of the theatre to the ridge of the frame, the opening of number 13 is 8ft 6in from the middle of the theatre to the ridge of the adjustable frame [a relocatable frame structure with access ladders running on a track] which gives to each a graduation of 8ft 6in. This makesthe raised part of the theatre 17ft wide, parallel up to number 8, the raised part of number 8 to number 13, 14ft wide, parallel to the middle of the theatre.

The first adjustable frames are 22ft high from the theatre to the head, and 4ft wide from exterior to exterior. From number 1 to number 13, each adjustable frame has a graduation [step ladder] of 11in, and all the adjustable frames are of equal width.

Factual [and technical] details of the terms used in the construction of the aforementioned theatre [Opé ra de Paris]. Description of the plates:

Plate I: Plan of the masonry foundations for the machinery of the New Opera Theatre built at the Palais Royale.

Plate II: General plan of the platforms placed on the aforementioned breeze-blocks [masonry foundations], and plan of the drum-wheels [large-diameter hoists] used for all the changes of scenery.

Plate III: Plan of the first underside [sub-floor] of the drum-wheels.

Plate IV: Plan of the drum-wheels of the wave mechanisms, with the drum-wheels for the wings [illustrated] from the second sub-floor.

Plate V: Third sub-floor with the withdrawal rollers and the rope rollers for the frame changes.

Plate VI: Plan of the theatre at the level of the scenery, [illustrating] the distribution of the traps and trapdoors and the stops of the frames.

Plate VII: Cross-section of the width of the first two floors [sub-floors] of ths underneath of the theatre of the Opé ra de Paris, with different details of construction.

Plate VIII: Section of the two floors [sub-floors] of the underneath of the theatre, with [a] section of the drum-wheels and of the withdrawal rollers; pictorial elevation of the trucks carrying the adjustable frames, rolling on their prescribed track.

Plate IX: Longitudinal section of the two sub-floors, [with a] pictorial section of the breeze-blocks bearing the platforms of the trusses, and [an] elevation of the pillars of the trusses where the pulleys for returning the ropes to the drum-wheels of the counterweights are bolted down.

Plate X: Section of the two sub-floors with the incline of the theatre, and [also ilustrating the] construction of the assembled frames equipped with their ironwork pieces.

Plate XI: Section, constructions, [pictorial] developments and details of the machinery used below the theatre.

Plate XII: Details of all the [scene] changing equipment of the underneath of the theatre.

Plate XIII: Pictorial elevations of the trucks used for changing, carrying and driving the adjustable frames and scenery of the theatre [as referred to] from number 1 to number 5.

Plate XIV: Truck [for use with set changes] from number 5 to number 8, with [details of] its construction, its iron strengthening and details - for the location of oblique [remotely positioned] trees, and other picturesque scenery.

Plate XV: Truck [for use with set changes] from number 8 to number 13 for the provision of the picturesque scenery detailed in plate XIV.

Plate XVI: Plan and pictorial elevation in section of the wave motion constructed within the framework of the trusses.

Plate XVII: Pictorial elevation of the supports serving as structure [on which] to mount the wave motion with its equipment.

Plate XVIII: Section and elevation over the face[s] of the trap lifts with the starting-handle of the levers and the opening from the traps of the main stage, with the rollers on which the traps pass [in order] to open them when the need arises.

Plate XIX: Section of the height and width of the theatre with details of the mechanism of the adjustable frames.

Plate XX: [Sectional] elevation of in its height and width [of the theatre] and the way in which the frames are let down in order to free the stage area [from obstruction].

Plate XXI: Section of the height and width of the theatre [illustrating] the wave motion movement.

Plate XXII: Neptune's boat, fabricated from shells, leaving from below [the depths of the ocean] and supported on the third sub-stage structure.

Plate XXIII: Section of the height and breadth [of the theatre] with wave rollers activated.

Plate XXIV: Section of the height and breadth of the theatre [illustrating] the provision for altar scenery.

Plate XXV: Construction of the traps and trapdoors serving the floor of the theatre and construction of the counterweights.

Plate XXVI: Floors of the catwalks on which are constructed the winding-drums for the working of the counterweights.

Plate XXVII: Finished design and pictorial representation of the gearing [mechanism] of the lever and of the roller [device] serving for the opening of the traps which denote the details of plate XVIII.