A description of the apparatus used in microwave phase and diffraction measurements is contained in the first chapter of this thesis. The field was investigated by a phase technique and the point source of radiation reasonably well established. Several diffraction patterns about a dielectric and a conducting rod were taken at several distances behind the rod with E vector of the field parallel to the axis of the rod. These were qualitatively analysed and compared with the patterns of one other worker at 1.25 cm. Agreements and differences were noted. / Thesis / Master of Science (MS)