Overhead Projector

An overhead projector is a variant of slide projector that is used to display images to an audience.

Read more about Overhead Projector:  Mechanism, History, Decline in Use

Famous quotes containing the word overhead:

    During a walk or in a book or in the middle of an embrace, suddenly I awake to a stark amazement at everything. The bare fact of existence paralyzes me... To be alive is so incredible that all I can do is to lie still and merely breathe—like an infant on its back in a cot. It is impossible to be interested in anything in particular while overhead the sun shines or underneath my feet grows a single blade of grass.
    W.N.P. Barbellion (1889–1919)