(under subclass 443) Subject matter wherein the screen upon which an image is formed is adapted to have an outline of the image traced or sketched thereon.
(1) Note. The instrument, commonly referred to as a camera lucida, usually includes a prism or mirrors and sometimes a lens to cause a virtual image of an object to appear as if projected upon a plane surface so that an outline may be traced.
SEE OR SEARCH THIS CLASS, SUBCLASS:
369, and 400, for a compound lens system combined with a viewing screen.
448, for a lens combined with a viewing screen.
449, for a reflector combined with a viewing screen.
SEE OR SEARCH CLASS
353, Optics: Image Projectors, 44, and 45 for an image projector having a concentrated source of light to project an image for the purpose of tracing it.
