| 摘要 |
<p>EXTENSION PLATFORM TO SUPPORT TRANSPARENCIES FOR AN OVERHEAD PROJECTOR An extension platform for holding a book of transparencies in an operative position on an overhead projector includes a body member adapted to receive and hold a book of transparencies, at least two suction cups positioned on the underside of the body member for attaching and securing the body member to the stage area of an overhead projector and fulcrum means located under the body member which translates the downward gravitational force of the weight of the book of transparencies into an upward pull on the suction cups. In one embodiment, the extension platform is an integral part of a book of transparencies.</p> |
