Rowbotham, Thomas Leeson; Rowbotham, Thomas Charles Leeson [Ill.]; Dalziel, George [Ill.]: The Art Of Sketching From Nature (London, 1852)

THE VERTICAL LINE.

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E is called the point of sight, or place of the eye.

C, the centre of view, or centre of the picture j being
the point on the horizontal line H H} immediately oppo-
site to the eye.

(This point C, must not be mistaken for the centre of
the paper; it bears no such meaning, for it is marked,
occasionally, somewhat rather to the right, or to the left, of
the middle of the horizontal line j but in all cases it is
termed the "centre of view/3 or " centre of the picture.")

B D, the base line, equal in length to E C ;

S, the point on the ground immediately opposite the
foot of the sketcher, as C is opposite to his eye ;

E S, the vertical line—the length of which is equal to
the supposed, or known, distance of the eye from the
commencement of the picture at S. It is necessary to
explain that E is not the real position of the eye, and that,
as it is requisite for practise to draw the length of the
vertical line E S upon the paper, and as this cannot
always be done with convenience beloiv the base line, as
in Fig. 1, it may be drawn above, as shown in Fig. 2; the
only limitation being in this case that the extent of the
base line B D is determined by E C, not as in Fig. 1, by
E S, as the space from S to C is allowed for the height
of the eye above the ground.

The use of this vertical line is the same, whether it be
drawn above or below the centre of view C; and it is
shown in the two positions, in Figs. 1 and 2, merely