1890 June 18 meeting of the Royal Meteorological Society

1890 March 14 meeting of the Royal Astronomical Society

1890 March 19 meeting of the Royal Meteorological Society

1890 March 29 meeting of the Astronomical Society of the Pacific

1890 May 21 meeting of the Royal Meteorological Society

1890 May 31 meeting of the Astronomical Society of the Pacific

1890 May 9 meeting of the Royal Astronomical Society

1890 November 14 meeting of the Royal Astronomical Society

1890 November 19 meeting of the Royal Meteorological Society

1890 November 29 meeting of the Astronomical Society of the Pacific

1891 April 10 meeting of the Royal Astronomical Society

1891 April 15 meeting of the Royal Meteorological Society

1891 December 11 meeting of the Royal Astronomical Society

1891 December 16 meeting of the Royal Meteorological Society

1891 February 13 meeting of the Royal Astronomical Society

1891 February 18 meeting of the Royal Meteorological Society

1891 February 25 meeting of the British Astronomical Association

1891 Gondola CCD Spectrum

1891 January 21 meeting of the Royal Meteorological Society

1891 January 31 meeting of the Astronomical Society of the Pacific