Matthew Holbeche Bloxam, The Principles of Gothic Ecclesiastical Architecture…
“ A characteristic distinction between screen-work of an earlier date than the fifteenth century and screen-work of that period will be found to consist in the slender cylindrical shafts, often annulated, sometimes not, with moulded bases and capitals which pertain to early work of the thirteenth and fourteenth centuries, and the mullion-like and angular-edged bars, often faced with small buttresses, which form the principal vertical divisions in screen-work of the fifteenth century. ”
