human
of pencil drawings, and in taking out the lights of a sketch (as pointed out on page 127), and results have been obtained by careful draughtsmen during the last six months which a year ago would have been considered impossible. These results have been obtained principally by good printing and paper--allowing of a fine grain on the block--but where the illustration has to be prepared for printing, say 5,000 an hour, off rotary machines, a coarser grain has to be used, producing the
gpt
Berlin wool pattern