Howard, Frank: The sketcher's manual: or, the whole art of picture making reduced to the simplest principles by which amateurs may instruct themselves without the aid of a master (London, 1841)

IS PICTORIAL, EFFECT.

connect them, would form a triangle with
unequal sides. A fine example is selected from
Rembrandt's etchings (see Plate V.); and an
arrangement of the lights, very similar to this,
may he found in numberless works of the classes
of historical painting and landscape, of all schools,
since the general adoption of Chiaroscuro by
Leonardo da Vinci.