Slide rule, Pickworth's Patent Cotton Cloth Computer, closed frame, double slide, celluloid laminate on wood, scales engraved into celluloid.
Upper stock: Weight of Warp or Weft in Piece
Price of Warp or Weft in Piece
Upper Slide: Counts of Yarn and Number of Hanks
Price of Yarn per Lb [Pound]
Lower slide: Picks of Reed per inch
Width in Inches
Lower stock: Length in Yards
Name and manufacturer notes on slide rule, in top center ' Pickworth's Patent Cotton Cloth Computer ', in left bottom ' C.N. Pickworth, Wh. Sc., Fallowfield, Manchester ', in right bottom ' Copyright - Ent'd. at Stationers' Hall '.
White paper label on reverse, handwritten in black ' Bromley 1982-147 '.