1920 May 19 meeting of the Royal Meteorological Society

1920 May 26 meeting of the British Astronomical Association

1920 May 7 geophysical discussion

1920 November 12 meeting of the Royal Astronomical Society

1920 November 17 meeting of the Royal Meteorological Society

1920 November 24 meeting of the British Astronomical Association

1920 November 5 geophysical discussion

1920 October 27 meeting of the British Astronomical Association

1921 April 20 meeting of the Royal Meteorological Society

1921 April 27 meeting of the British Astronomical Association

1921 April 8 meeting of the Royal Astronomical Society

1921 December 2 geophysical discussion

1921 December 28 meeting of the British Astronomical Association

1921 December 9 meeting of the Royal Astronomical Society

1921 February 11 meeting of the Royal Astronomical Society

1921 February 16 meeting of the Royal Meteorological Society

1921 February 23 meeting of the British Astronomical Association

1921 February 4 geophysical discussion

1921 January 14 meeting of the Royal Astronomical Society

1921 January 19 meeting of the Royal Meteorological Society