1930 April 16 meeting of the Royal Meteorological Society

1930 April 30 meeting of the British Astronomical Association

1930 December 12 meeting of the Royal Astronomical Society

1930 December 17 meeting of the Royal Meteorological Society

1930 December 19 geophysical discussion

1930 December 31 meeting of the British Astronomical Association

1930 February 14 meeting of the Royal Astronomical Society

1930 February 19 meeting of the Royal Meteorological Society

1930 February 26 meeting of the British Astronomical Association

1930 January 1 meeting of the British Astronomical Association

1930 January 10 meeting of the Royal Astronomical Society

1930 January 15 meeting of the Royal Meteorological Society

1930 January 29 meeting of the British Astronomical Association

1930 January 31 geophysical discussion

1930 June 13 meeting of the Royal Astronomical Society

1930 June 13 meeting of the Royal Astronomical Society (cont.)

1930 June 18 meeting of the Royal Meteorological Society

1930 June 25 meeting of the British Astronomical Association

1930 Lucifer CCD Spectrum

1930 March 14 meeting of the Royal Astronomical Society