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

11

THE VERTICAL LINE.

It must, however, be observed, that this forms the
extteme limit of the picture, laterally. Any portion of
the view may be taken, within that limit ; as is exempli-
fied in the Frontispiece of this book.

THE VERTICAL LINE.

That an accurate notion of the vertical line may be
obtained, the plane of the picture must be supposed to
be perpendicular to the horizontal plane.

It' a straight line be drawn from the spectator's eye,
perpendicular to this plane of the picture, that line will
tall upon, the plane at a point m the horizontal line
directly opposite to the eye. In Figs. 1 and 2, C is
this point, and it is called the centre of the picture, or
centre of view. In reference to the eye of the spectator,
every straight line perpendicular to the plane of the
picture appears to converge towards this point or centre.
The line which, drawn from the eve of the spectator,
determines this centre C, is called the vertical line. It is
a straight line through S, perpendicular to the hori-
zontal line, and the base of the picture ; and in Figs. 1
and 2 it is represented by the line EC.

In Fig.. 2, the lines and points before described are
further illustrated ; and to impress them clearly on the
mind of the student, we recapitulate them, as they are
exemplified in this figure.