Whittock, Nathaniel: The Oxford Drawing Book, Or The Art Of Drawing, And The Theory And Practice Of Perspective: In A Series Of Letters Containing Progressive Information On Sketching, Drawing, And Colouring Landscape Scenery, Animals, And The Human Figure: With A New Method Of Practical Perspective: Detailed In A Novel, Easy, And Perspicuous Style, For The Use Of Teachers, Or For Self-Instruction. Embellished With Upwards Of One Hundred And Fifty Lithographic Drawings, From Real Views, Taken Expressly For This Work (Oxford , London, 1825)

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You must be particular in making the outline of the angle higher than the two out-
side lines. To you this may appear singular, as you are aware that the walls are
nearly the same height. I cannot explain the cause of this till I write to you on per-
spective ; till then you must be content to copy what you see in the drawing, and let
the outline run as like it as you can. Having made a correct and free outline, draw
the first shade (making the lines light and close together) over the whole of the tower,
then go over the dark side with the second shade. The outline previously made of
the loop holes and the window, will shew through both shades, and must now be
made darker, yet still taking care that none of your touches are so dark or so thick
as those you will afterwards use in the bridge; as the tower is supposed to be at some
distance from the bridge, and it is only by not letting either the light or the shade
appear so strong as they do in the foreground, that you can make the distant ob-
jects recede.
Having finished the tower, mark the outline of the trees, taking care to give your
hand that circular motion I before directed ; fill up the outline of the trees with short
lines of the second shade, a little darker than those used on the tower, because they
are nearer to the eye. The outline of the bridge must now be made darker; and here
you may make black free touches, as the darker this appears, the more it will come