This is a novel effect in lighting, and especially hard to get and can only be obtained after repeated trials, so don't become discouraged after the first trial.
To secure it, place the background directly in front of, and across the window. Place the chair about three feet in advance of the ground. Draw the lower curtain up until it covers half of the upper sash, leaving the top curtain up. Place the camera directly facing the window. Now have the subject turn the head slowly toward the light, until a line of light forms running down the profile of the face. This line should be so fine as to leave the appearance of being drawn with a pencil. If the side reflector and the head screen are needed, use them as directed in Chapter I (Introduction). A better understanding of this lighting may be had by studying the diagram that accompanies the article.
Window Photography. Line Lighting.
In making any of these lightings by a window and more especially the line lighting, a hood of blackened tin should be used, covering the lens, so as to prevent light striking it, and thus causing fog.