High pressure pre-heater for feed water

Claim 1

IN A HIGH PRESSURE PRE-HEATER FOR FEED WATER: A HOUSING HAVING AN OPENING AND ALSO HAVING A STEAM INLET AND A DRAIN OUTLET, A COVER PLATE CLOSING SAID OPENING AND PROVIDED WITH A FIRST GROUP AND A SECOND GROUP OF PASSAGES THERETHROUGH AND DISTRIBUTED IN UNIFORMLY SPACED RELATION THEREOVER, FIRST COLLECTOR MEANS ARRANGED OUTSIDE SAID HOUSING AND COMMUNICATING WITH SAID FIRST GROUP OF PASSAGES FOR CONVEYING SAID WATER THERETO, SECOND COLLECTOR MEANS ARRANGED OUTSIDE SAID HOUSING AND COMMUNICATING WITH SAID SECOND GROUP OF PASSAGES FOR RECEIVING HEATED FEED WATER THEREFROM, AND A PLURALITY OF TUBES INSIDE SAID HOUSING HAVING THEIR ENDS CONNECTED TO SAID FIRST AND SECOND GROUP OF PASSAGES RESPECTIVELY AND HAVING THEIR INTERMEDIATE PORTIONS BETWEEN SAID ENDS EXTENDING NEARLY THROUGH THE ENTIRE LENGTH OF SAID HOUSING, SAID TUBES EXTENDING FROM SAID FRIST GROUP OF PASSAGES AND ALSO FROM SAID SECOND GROUP OF PASSAGES FIRST THROUGH AT LEAST THE MAJOR LONGITUDINAL EXTENSION OF SAID HOUSING IN A DIRECTION AWAY FROM SAID COVER PLATE AND THEN EXTENDING SUBSTANTIALLY ALONG STRAIGHT LINES AT LEAST ONCE IN THE OPPOSITE DIRECTION THROUGH A PORTION OF SAID HOUSING UP TO A CERTAIN PLANE, THE TUBES IN THE PORTIONS LEADING AWAY FROM SAID PLATE BEING OFFSET ANGULARLY TOWARD EACH OTHER IN THE REGION OF SAID CERTAIN PLANE SO AS TO LEAVE SPACE IN THE CENTER OF THE HOUSING FOR PORTIONS OF THE TUBES EXTENDING IN THE OPPOSITE DIRECTION, THE SPACING OF SAID TUBES FROM EACH OTHER BELOW SAID CERTAIN PLANE BEING A FRACTION OF THE SPACING OF SAID PASSAGES FROM EACH OTHER IN SAID COVER PLATE.