quadrant, quadrant stay, a metal device for holding open a casement window.
In the early example it can be seen that the sprung quadrant will hold open the casement by means of friction. The elegant scrolled terminal prevents the casement from opening more than ninety degrees. To prevent it from blowing back in a high wind and shattering the glass quarries a small notch is provided in the quadrant at a convenient point. The casement can be released by hand pressure.
quarry, quarrel, a square, rectangular, or lozenge–shaped piece of glass held in position by lead cames [French: carré, square].
In other words — leaded lights.
Queen Anne arch, an arcuated lintel over a Serliana, Venetian/Palladian window, consisting of red brick rubbers.