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No description available.

no abstract provided by author / Master of Science

Tests were made at the Lubrication Laboratory at Virginia Polytechnic Institute to determine the mechanism of corrosion of Cadmium-Silver-Copper bearing metals, and if possible to develop a procedure to quantitatively rate oils and inhibitors with respect to corrosion. Two pieces of testing apparatus were employed - a jet-type oil bath and a glass apparatus. It was found that corrosion of the cadmium base bearing metals took place in the jet-type oil bath with jet velocities equal to 1.51 feet per second at temperatures of 300 and 325° F with Esso Motor Oil, No. 3. Corrosion did not take place at temperatures of 300 and 325° F in the jet-type oil bath when the jet velocities were decreased to 0.67 feet per second. Tests on the glass apparatus indicated that the corrosion was not electrolytic, that the presence of air (oxygen) at the oil-bearing interface was necessary for corrosion to proceed, and that the scrubbing action of the oil past the bearing face only partially influences the rate of corrosion. The jet-type apparatus is believed to be quantitative in its results if the surface condition of the bearing specimens and the velocity of the issuing oil jets are accurately controlled. Viscosity of the oil prior to and after the test was measured. No consistent trend of viscosity was noted, but a tendency for the viscosity of the oil to be directly proportional to the total weight of metal lost by corrosion was pointed out. / M.S.

The original circuit diagram was drawn previous to any reference work on the subject; however, in the construction of the system it was found necessary to add to and subtract from the original circuit. For instance, in order to isolate the oscillator from the modulator and to amplify the carrier voltage it was necessary to add buffer amplifier stages; since only one system was built and since the system worked on the tuned detector principle, no filters were deemed necessary. Other circuit changes of minor importance are; the use of individual plate voltage supplies to minimize feedback between stages; the use of regenerative detection; and a variation in the obtaining of the oscillator output. The system works satisfactorily, but is very critical; this is largely due to the fact that regenerative detection is used. Once the system is adjusted for quiet distortionless operation, it is found that an increase in modulating potential sufficient to over modulate the carrier introduces distortion. This is probably due to the fact that the tube is not operating on a parabolic portion of the grid voltage plate current characteristic curve during a large portion of each cycle, thus introducing third order, fourth order, fifth order, and nth order distortion terms.* * It is to be remembered that the plate current can be expressed as a power series of n terms of the grid voltage, i.e. --- [see equation] The number of terms depends upon the portion of the curve over which the tube is operating; thus, for "square-law" or second order modulation, which occurs over the parabolic portion of the characteristic curve, n = 2; for third order modulation, n = 3; etc. / M.S.

This investigation was undertaken in order to determine the characteristics of crude fatty acids, recovered from the resin soap wastes of kraft pulp manufacture, so that efficient distillation units may be designed for distillation of the crude fatty acids. It was found that the crude fatty acids could be distilled at a maximum absolute pressure of 7 m.m., and at a temperature range of 400° to 520ºF. At this temperature range approximately 70% of the total can be recovered as distillate without impairing the quality of the distillate. The remaining 30% is removed as pitch. It was found that when 70% of the total has been distilled approximately 85% of the fatty acids and 80% of the abietic acid originally present have been recovered Crude fatty acids corroded to a marked extent all of the feasible alloys and metals of construction with the exception of the stainless steel containing not less than 20% chromium and not less than 9% nickel. It was found that the most suitable alloy was a chromium-nickel-iron alloy containing 29% chromium and 9% nickel, the balance being iron. / Master of Science

M.S.

published_or_final_version / History / Master / Master of Philosophy

The present work deals with the creation of a second Irish Constitution in the history of Irish independence. Replacement of the previous Constitution was motivated by its connection with the controversial Anglo-Irish Treaty 1921. This thesis focuses on the situation in the 20's and 30's of the 20th century, the Irish Free State, when there were internal unrest caused by emergence and recognition of the Constitution 1922 from which the Irish republican on the contrary wanted to break away. Their efforts lasted until the new Constitution in 1937. The work also includes a chapter devoted to the events that preceded the periods, which is primarily devoted. These events were Irish War of Independence and subsequent Civil War. The main part describes the internal situation in the Irish Free State in terms of social, economic and political issues, because all intermingled with each other and lead to the onset political forces that have targeted the country led to the new legislation. An integral part of this work is the preparation and procedure whereby which the Constitution was created. They are also included positive and negative opinions of important personalities of the time. Proposals constitution and amendments laws that gradual way contributed to the final concept of the Constitution 1937 are...