Double-walled ultra-high vacuum vessel defining a work chamber

Claim 1

IN AN ULTRA-HIGH VACUUM VESSEL FOR REACTIONS AND THE LIKE IN A GAS FREE AREA HAVING AN OUTER WALL HOUSING ADAPTED TO RESIST THE OUTER ATMOSPHERIC PRESSURE, AN INNER WALL DEFINING AN INTERIOR WORK CHAMBER AND SPACED FROM SAID OUTER WALL, SAID OUTER AND INNER WALLS DEFINING A PROTECTIVE CHAMBER SURROUNDING SAID WORK CHAMBER, INDEPENDENT CONDUIT MEANS FOR SEPARATELY CONNECTING SAID WORK CHAMBER AND SAID PROTECTIVE CHAMBER TO AT LEAST ONE PUMP UNIT FOR EVACUATING SAID WORK CHAMBER TO AN ULTRHIGH VACUUM AND SAID PROTECTIVE CHAMBER TO A HIGH VACUUM, SAID OUTER AND INNER WALL HAVING RESPECTIVE APERTURES SUBSTANTIALLY IN ALIGNMENT WITH EACH OTHER, SAID APERTURES BEING OF SUBSTANTIALLY THE SAME AREA, MEANS EXTENDING THROUGH AT LEAST ONE PAIR OF SAID ALIGNED APERTURES IN SAID WALLS FOR TRANSMITTING ENERGY FROM THE OUTSIDE INTO SAID WORK CHAMBER, AND MECHANICAL SEALING MEANS FOR SEALING SAID ENERGY TRANSMITTING MEANS RELATIVE TO SAID OUTER WALL, MEANS EXTENDING THROUGH SAID INNER WALL APERTURE SPACED FROM THEAPERTURE WALL AND EXTENDING SUBSTANTIALLY ON EACH SIDE OF THE INNER WALL, SAID ENERGY-TRANSMITTING MEANS EXTENDING THROUGH SAID LAST NAMED MEANS IN THE APERTURE IN SAID INNER WALL IN A MANNER SO AS TO LEAVE A FREE NARROW GAP CONNECTING SAID WORK AND PROTECTIVE CHAMBERS, SAID GAP HAVING A CONSIDERABLE LENGTH AND FORMING A DIFFUSION GAP FOR SUBSTANTIALLY SEALING SAID WORK CHAMBER RELATIVE TO SAID PROTECTIVE CHAMBER.