skewback การใช้

Door and window lintels are formed of skewback ( flat ) arches and not single stones or timbers.
Several moulded chimney shafts in Tudor style . 2 original openings ( one blocked ) to east facade with skewback arches.
Each span has four arches which are seated on the skewback stones of the abutments and piers separated by a steel shoe to help prevent rotting.
The latter solution was chosen for all subsequent American SSNs . " Permit " and later submarines of this class had seven-bladed skewback screws, which reduced the problem of blade-rate, but reduced the submarines'top speed to 29-28 knots . " Jack " was designed with counter-rotating screws, each of which were smaller than the standard seven-bladed screw, as an alternative solution to the blade-rate problem.