|   
                     
                     1863
                     
                    
                     
                     Plate II: Observatory signals : used at 
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate II: Observatory signals : used at 
                     
                    | 
      
        |   
                     
                     1863
                     
                    
                     
                     Plate III: Elevation of the Scaffold use
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate III: Elevation of the Scaffold use
                     
                    | 
      
        |   
                     
                     1863
                     
                    
                     
                     Plate IV: Plan and elevation of the plat
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate IV: Plan and elevation of the plat
                     
                    | 
      
        |   
                     
                     1863
                     
                    
                     
                     Plate V: Elevation of the scaffold used 
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate V: Elevation of the scaffold used 
                     
                    | 
      
        |   
                     
                     1863
                     
                    
                     
                     Plate VI: Elevation of the French scaffo
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate VI: Elevation of the French scaffo
                     
                    | 
      
        |   
                     
                     1863
                     
                    
                     
                     Plate VII: Elevation of the French scaff
                     
                    
                     
                     Survey Book
                     
                    
                     
                     Plate VII: Elevation of the French scaff
                     
                    |