Optical apparatus for making and reconstructing holograms

Claim 1

OPTICAL APPARATUS FOR RECONSTRUCTING HOLOGRAMS COMPRISING A FLAT PLATE, A LIGHT BULB OF RELATIVELY SMALL DIMENSIONS MOUNTED TO SAID PLATE, MEANS ALSO MOUNTED TO SAID PLATE FOR PASSING A CURRENT THROUGH SAID BULB TO CAUSE LIGHTING THEREOF, A PLURALITY OF FLAT MIRRORS MOUNTED TO SAID PLATE IN A GENERALLY CIRCULAR ARRANGEMENT HAVING THEIR FACES ORIENTED SO THAT THE LIGHT FROM SAID BULB IS SUCCESSIVELY REFLECTED BY SAID MIRRORS SO AS TO INCREASE THE EFFECTIVE DISTANCE OF TRAVEL THEREOF, ALL OF SAID MIRRORS HAVING THEIR FACES PERPENDICULAR TO SAID PLATE EXCEPT FOR THE FACE OF THE LAST MIRROR TO WHICH SAID LIGHT PASSES WHICH IS TILTED AWAY FROM SAID PLATE SO THAT THE LIGHT REFLECTED BY SAID LAST MIRROR IS DIRECTED AWAY FROM SAID PLATE AT A PREDETERMINED ANGLE, A CASING TO WHICH SAID PLATE IS MOUNTED ENCLOSING SAID BULB, SAID MEANS AND SAID MIRRORS, AN ADJUSTABLE BELLOWS HAVING ONE END MOUNTED TO SAID CASING, A VIEWING LENS MOUNTED TO THE OTHER END OF SAID BELLOWS, SAID BELLOWS AND SAID LENS BEING CONSTRUCTED AND ARRANGED IN CONJUNCTION WITH SAID CASING SO THAT THE LIGHT REFLECTED BY SAID LAST MIRROR PASSES TO SAID LENS THROUGH SAID BELLOWS, AND MEANS ON SAID CASING TO PERMIT A HOLOGRAM TRANSPARENCY TO BE INSERTED IN THE PATH OF THE LIGHT BETWEEN SAID LAST MIRROR AND SAID LENS, THE NUMBER OF SAID PLURALITY OF MIRRORS BEING SUFFICIENT SO THAT THE LENGTH OF THE PATH OF TRAVEL OF SAID LIGHT IS SUBSTANTIALLY GREATER THAN THE DISTANCE BETWEEN SAID LENS AND SAID TRANSPARENCY.