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Ojai Symposium
A.A. Merrill at the 1st Harvard-Boston Air Meet
Harold Brown--at the cutting edge
Damage from the Long Beach earthquake
Damage from the Long Beach earthquake
Cornelis A. G. Wiersma in the lab
Group at a conference
Cornelis A. G. Wiersma
Octave Chanute
Ferdinand Ellerman at the 150′ Solar Tower, Mt. Wilson
Astronomer Miss Annie Cannon (foreground)
Charles E. St. John
Spectrohelioscope house, coelostat uncovered ready for use
Window on north side of spectrohelioscope house, showing light tube and control rods
H. A. Lorentz
Babcock-Harvard station
Mt. Wilson Snow Solar Telescope construction site
George Ellery Hale in his automobile
Spectrohelioscope house, coelostat covered
Willem de Sitter