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Thesea ad examen doctoratûa subeundum: I* • Bet iuxta ordinem naturae ut materia prima fuisset disposita per evolutionem specierum, aub influxu tamen causae superioris, ad recipiendam animam humanam primi horni nia» II. - Scientia si sumatur in sua ratione formali non est una, sed multiplex, et aio diversae scientiae speculativae distinguantur ex déversa abstractions a materia, ita quidem ut generica distinctio secundum suprema genera sumatur ex recessu a materia, specifica vera secundum speciem atomam ex accessu ad determinatum gradum immaterialitatis » III» - Deus in quantum est motor universalia non potest infere violentiam creaturae, bene vero ut particularis motor. / Montréal Trigonix inc. 2018

The purpose of this thesis has been the determination of the nature and cause of time-softening property of the lead-tin alloys in the solid solution range. An alloy of 19% tin, 81% lead was chosen as exhibiting the property to a degree suitable for observation of the accompanying phenomena. The investigation proceeded in three parts: (1) an observation of the time-softening property itself by means of series of hardness tests to determine the degree of change and the time required for its accomplishment; (2) a search for x-ray evidence of possible precipitation which might be apparent as a change in the lattice constant of the crystal; and (3) conductivity measurements as a further check on whether the solution concentration was changing. The results accordingly may be classified under the same three headings. The change in hardness of the lead-tin alloy under investigation is intimately related to its habit of precipitating some of the excess tin from the solid solution. Both the x-ray and the conductivity test results offer supporting evidence that precipitation does occur in conjunction with the softening effect. Apparently also the softening effect observed in the lead-tin alloy is a definite phenomenon distinct from the “over-aging” effect in which an alloy aged at high temperature increases rapidly in hardness until a certain critical hardness is reached, after which softening sets in. / M.S.

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High frequency induced electrical energy has been used by medical science for several years to produce heat internally in the human body. The uses of such a process are many and varied. They range all the way from producing artificial fever in the entire body to heating one certain afflicted spot such as a rheumatic joint. / Master of Science