i;o NOTES ON DOCKS AND DOCK CONSTRUCTION. 



ashlar. The height from the coping to the skewback of the 

 invert is 47 feet 5 inches, with a batter on the face of 6 feet 3 

 inches curved to a radius of 157 feet. The inverts are of brick 



FIG. H8. 



3 feet thick, the radius to which they are formed being 105 

 feet, and the depth, at the centre, from the chord line 4 feet. 



SECTION ON LINE A B 

 FIG. 149. 



The lower sills are placed 2 feet 7 inches above low water 

 of equinoctial spring tides. The lift of the upper sill is 8 feet 

 3 inches above the dock floor. 



