Notes and calculations by Edward Appleton, c. 1934-1965 and no date

Notes and calculations by Edward Appleton. The material is about or related to magneto­ionic research but was not included in the original folder. It consists of 'Some Unsolved Ionospheric Problems', 2 pages, no date but after 1943; 'Oblique Incidence', 1 page, c. 1934; a 4 page note 'To show that, assuming perfect reflection a tilted aerial can give no information of direction of reflected wave', no date, c. 1934; 6 pages of notes on vertical and oblique incidence, no date; and miscellaneous shorter calculations.