1921 January 26 meeting of the British Astronomical Association

1921 June 10 meeting of the Royal Astronomical Society

1921 June 15 meeting of the Royal Meteorological Society

1921 June 17 geophysical discussion

1921 June 29 meeting of the British Astronomical Association

1921 March 11 meeting of the Royal Astronomical Society

1921 March 16 meeting of the Royal Meteorological Society

1921 March 30 meeting of the British Astronomical Association

1921 March 4 geophysical discussion

1921 May 13 meeting of the Royal Astronomical Society

1921 May 18 meeting of the Royal Meteorological Society

1921 May 25 meeting of the British Astronomical Association

1921 May 6 geophysical discussion

1921 November 11 meeting of the Royal Astronomical Society

1921 November 16 meeting of the Royal Meteorological Society

1921 November 30 meeting of the British Astronomical Association

1921 November 4 geophysical discussion

1921 October 26 meeting of the British Astronomical Association

1921 September 7 meeting of the Royal Meteorological Society

1922 April 12 meeting of the Royal Astronomical Society