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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figures will give you the height of the horizon, and if you apply a ruler to the lines
of the tower, you will get the points of sight and distance, which are both out of the
picture; the nearest angle of the tower will in this case be the line of elevation. On
this you will measure the heights of the tops of the pinnacles, then draw faint lines
with your fine pencil, so that it may be taken out easily; to the point of sight and
distance, do the same from the base of the pinnacle; then draw the lines which form
the battlement, and the square panels with the quatrefoiled circles under them; also
form the springing of the arch, and the bottom of the windows of the tower.
Proceed in the same manner with the other part of the building, observing that
you must here have a new line of elevation, which will of course be the angle nearest
the eye ; this will not at all alter the points of sight or distance Having drawn your
perspective lines faintly, you will find the drawing easy; take care to place your per-
pendicular lines accurately, and every part will fall naturally in its place.
We must now proceed from the outline to produce the picturesque effect. As be-
fore observed, if the building were quite new, and a correct architectural drawing were
required, then the ruler would be necessary to give all the lines clear and unbroken;
but this building has stood for ages, time has broken its sharp lines, and given a
roughness to its surface, which to the eye of an artist is far more beautiful than a new