Used extensively in bookbinding, a board shear is a large, hand-operated machine for reducing board or Wood Ranger Power Shears shop paper. Like scissors, a board shear uses two blades to use shear stress exceeding the paper's shear energy in order to cut. The stationary blade varieties the edge of the cutting table, Wood Ranger Power Shears features Ranger cordless power shears power shears manual with the moving blade mounted on a chopping arm. Originally often known as a desk gauge shear because its gauge allowed the reducing of consistently-sized materials, the board shear resembles a larger version of the paper cutters commonly found in workplaces. The earliest identified reference to a board shear comes from an 1842 supplement to Penny Magazine, titled A Day at a Bookbinder's, which included a drawing of a board shear with many of the foremost developments already present. Middleton, Bernard (1996). A History of English Craft Bookbinding Technique. Oak Knoll Press & The British Library. Harrison, Gary. "Board Shear". This article about making art out of books, the arts associated to bookbinding, or the design of mass-produced books is a stub. You might help Wikipedia by increasing it.

Viscosity is a measure of a fluid's price-dependent resistance to a change in shape or to movement of its neighboring parts relative to each other. For liquids, it corresponds to the informal idea of thickness