Papers of Frank Dyson

Correspondence and discussion of astronomical methods with other observatories, 1892-1917, including material relating to lunar distances; the 5-figure logbook used at the Royal Observatory; the stereoscopic method of determining stars; copies of 'Parallax Determination by Photography', 1903, and 'The Value of Solar Eclipses for Geodetic Measurements', 1905, by C.E. Stromeyer; and R-D discordance.

Correspondence and discussion of astronomical methods, 1917-1936, including material relating to observations of stars at elongation to obtain fundamental declinations; the Principle of Minimum N.P.D.; the mean place of Polaris; and pendulum shutter apparatus.