Heat actuated pumps

Claim 1

IN A THERMALLY ACTUATED PUMP OF THE TYPE IN WHICH ALTERNATING VOLUMETRIC CHANGES ARE PRODUCED BY ALTERNATELY VAPORIZING LIQUID IN A FIRST PORTION OF SAID PUMP AND CONDENSING THE VAPORIZED LIQUID IN A SECOND PORTION OF SAID PUMP, IN COMBINATION, AN OUTER SHELL HAVING SPACE THEREIN, FIRST PARTITION MEANS IN SAID SHELL DEFINING A FIRST COMPARTMENT IN WHICH TO VAPORIZE LIQUID BY HEATING AND SECOND PARTITION MEANS IN SAID SHELL DEFINING A SECOND COMPARTMENT, SAID SECOND COMPARTMENT EXTENDING UPWARDLY IN SAID SHELL AT LEAST TO THE LEVEL OF THE TOP OF SAID FIRST COMPARTMENT AND BEING ADJACENT TO SAID FIRST COMPARTMENT IN WHICH TO COLLECT VAPOR FORMED IN SAID FIRST COMPARTMENT, SAID FIRST AND SECOND COMPARTMENTS TOGETHER ENCOMPASSING ONLY A PART OF THE TOTAL SPACE WITHIN SAID SHELL, AT LEAST A PART OF THE REMAINING SPACE INSIDE SAID SHELL CONSTITUTING A THIRD COMPARTMENT WITHIN WHICH TO CONDENSE VAPOR COLLECTED IN SAID SECOND COMPARTMENT, SAID THIRD COMPARTMENT HAVING A PORTION AT A HIGHER LEVEL THAN THE TOP OF SAID SECOND COMPARTMENT, SAID FIRST PARTION MEANS HAVING AN OPENING THEREIN AFFORDING COMMUNICATION FOR LIQUID FLOW BETWEEN THE LOWER PART OF SAID FIRST AND ONE OF SAID OTHER COMPARTMENTS, AND HAVING A SECOND OPENING THEREIN AFFORDING COMMUNICATION FOR VAPOR FLOW FROM