David P Todd

1855 – 1939

• An account of observations of the transit of Venus, 1882, made at the Lick Observatory, Mount Hamilton, California
• On the use of the electric telegraph during total solar eclipses
• Preliminary account of a speculative and practical search for a trans-Neptunian planet
• Solar parallax from the velocity of light
• Telescopic search for the trans-Neptunian planet