2. The position of the person with regard to the light should be so
that the latter will fall upon the page he is reading, and not upon
his eyes. It is generally considered most convenient to have the light
shine over the left shoulder, so that in turning the leaves of the
book, the shadow of the hand upon the page is avoided. It is not
always possible to do this, however, and, at the same time, to get
plenty of light upon the page. When one finds himself compelled to
face the light in reading, or in standing at a desk bookkeeping, he
should always contrive to shade his eyes from a direct light. This may
be done with a large eye shade projecting from the brow. A friend of
mine, a physician, is very fond of reading by a kerosene lamp, the
lamp being placed on a table by his side, and the direct light kept
from his eyes by means of a piece of cardboard stuck up by the lamp
chimney.