Dewar (James) Collection of  offprints/pamphlets, mostly from the 'Proceedings of the Royal Society and Philosophical Magazine', FOUR WITH DEWAR'S PRESENTATION INSCRIPTIONS, on low-temperature physics, superconductivity, liquefaction of gases, etc. (12) ***Working at the Royal Institution, Dewar carried out researches in gas liquefaction and was the first to liquefy hydrogen. Dewar's interest was mostly focused on the properties of matter at temperatures approaching absolute zero. Joining forces with John A. Fleming of University College, London, Dewar began a systematic charting of the specific resistances of metals, alloys and nonmetals from the boiling point of water to the lowest point within reach [-197 degrees C.] In the course of their investigations, Dewar and Fleming were able to gather accurate data on conduction, thermo-electricity, magnetic permeability and dielectric constants of metals and alloys from 200 degrees C. to minus 200 degrees C. Dewar's researches in low-temperature physics were greatly enhanced by his invention in 1892 of the vacuum-jacketed (Dewar) flask, the most important device for preserving and handling materials at low temperatures.