48. Einstein (Albert) and Leo Szilard. Improvements relating to Refrigerating Appartus, November 15, 1928; Refrigerating Machines in which the Pumping of Liquid is Effected by Intermittently Increasing the Vapour Pressure, [ Application date December 29 , 1927]; Refrigerating Machine with Organic Solvent, [ Application date January 24 , 1928]; Improvements in Refrigerating Processes and Apparatus, May 30 , 1929; Electrodynamic Movement of Fluid Metals particularly for Refrigerating Machines, May 26 , 1930; Pump, especially for Refrigerating Machines, March 3 , 1931, all Complete Patent Specifications [No.s 282,428; 282,808; 284,222; 293,865; 303,065 & 344,881], first editions , folding diagrams, disbound, library stamp on first pages, 4to (6)
est. £1500 – £2000
Motivated by a newspaper article on the death of a family due to poisonous gases leaking from a domestic refrigerator, Einstein discussed with Szilard the possibility of cooling via thermodynamics rather than the mechanical, piston-driven method then prevalent. These patents provide a good indication of the development of their invention.