Projector viewer

Claim 1

A PROJECTOR VIEWER COMPRISING A BASE, A LAMP HOUSING MOUNTED ON SAID BASE AND CONTAINING A LAMP AND LIGHT CONDENSER LENSES ABOVE SAID LAMP, A PAIR OF HORIZONTALLY SPACED, PARALLEL RODS EXTENDING FORWARDLY AND REARWARDLY ON OPPOSITE SIDES OF SAID HOUSING, MEANS ON SAID HOUSING SLIDABLY JOURNALLING SAID RODS FOR HORIZONTAL, FRONT-TO-REAR AND REAR-TO-FRONT SLIDING THEREOF RELATIVE TO SAID LAMP HOUSING, A CARRIAGE MOUNTED ON SID RODS AND MOVABLE HORIZONTALLY THEREWITH, A FRAME ON SAID CARRIAGE, MEANS ON SAID CARRIAGE ALONG THE FRONT AND REAR EDGES OF SAID FRAME SLIDABLY GUIDING SAID FRAME FOR HORIZONTAL MOVEMENT OF SAID FRAME RELATIVE TO SAID CARRIAGE IN OPPOSITE DIRECTIONS TRANSVERSE TO THE SLIDING MOVEMENT OF SAID RODS, UPPER AND LOWER, HORIZONTAL, TRANSPARENT PLATES MOUNTED ON SAID FRAME DIRECTLY ABOVE SAID LIGHT CONDENSER LENSES, A ROTATABLE SHAFT HAVING A KNOB ON THE FRONT OF SAID CARRIAGE, MEANS ROTATABLY JOURNALLING SAID SHAFT ON SAID FRAME OF SAID CARRIAGE, A RACK MOUNTED ON AND EXTENDING ALONG THE FRONT EDGE OF SAID FRAME, AND A PINION ON SAID SHAFT MESHING WITH SAID RACK, WHEREBY SAID FRAME CAN BE MOVED HORIZONTALLY ON SAID MOUNTING MEANS BY ROTATION OF SAID KNOB AND WHEREBY SAID CARRIAGE WITH SAID FRAME AND TRANSPARENT PLATES THEREON CAN BE MOVED BACK AND FORTH BY PUSHING OR PULLING SAID KNOB.