Edward C. Pickering

1846 – 1919

• Elements of physical manipulation
• Variable stars of long period
• A nebula photometer
• A plan for securing observations of the variable stars
• A plan for the endowment of astronomical research
• Absorptions of photographic wedges
• Appendix
• Color equation of various star catalogues
• Discussion of the revised Harvard photometry
• Distribution of energy in stellar spectra
• Distribution of stars
• Distribution of stellar spectra