Etching machine

Claim 1

AN ETCHING MACHINE ADAPTED TO ETCH ARCUATE PLATES, COMPRISING IN COMBINATION, AN ELONGATED ENCLOSED HOUSING HAVING A BOTTOM CHAMBER ADAPTED TO HOLD A BODY OF ETCHING LIQUID AND FRONT, REAR, SIDE AND TOP WALLS, MEANS IN SAID CHAMBER FOR THROWING ETCHING LIQUID UPWARD AGAINST AN ARTICLE TO BE ETCHED, SAID HOUSING HAVING IN THE FRONT WALL AN OPENING OF A SIZE TO PERMIT PASSAGE THERETHROUGH OF AN ARTICLE CARRIER, A CLOSURE MOVABLE ACROSS SAID OPENING, A TROUGH LOCATED IN FRONT OF SAID HOUSING AND EXTENDING FORWARD FROM SAID FRONT WALL, SAID TROUGH BEING LOCATED AT AN ELEVATION BELOW THE BOTTOM OF SAID OPENING TO PERMIT THE ARTICLE CARRIER TO BE MOVED OUT THEREOVER, A SHAFT EXTENDING FROM A SUPPORT ON THE REAR WALL OF SAID HOUSING THROUGH SAID OPENING AND TO A SUPPORT ON THE FRONT END OF SAID TROUGH, AN ARTICLE CARRIER SLIDABLY SUPPORTED ON SAID SHAFT, ROTATABLE ARTICLE-SUPPORTING FIXTURES MOUNTED ON SAID CARRIER, SAID CARRIER BEING OF A SIZE TO MOVE IN AND OUT OF SAID OPENING AND OVER SAID TROUGH WHILE THE CARRIER IS SLIDING ON SAID SHAFT AND SAID SHAFT IS MOUNTED ON ITS END SUPPORTS, AND MEANS FOR ROTATING SAID ARTICLE-SUPPORTING FIXTURES WHEN THE WORK CARRIER IS POSITIONED WITHIN SAID HOUSING, SAID SHAFT BEING ROTATABLY MOUNTED ON SAID END-SUPPORTS AND AT ITS REAR END CARRYING A ROTATABLE MEMBER WHICH ENGAGES ELEMENTS ON SAID ARTICLE-SUPPORTING FIXTURES WHEN THE ARTICLE CARRIER IS LOCATED IN ITS REAR POSITION IN SAID HOUSING.