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Light as a Tool
Storing LightThe Photographic Process
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achromatic angle angstroms angular aperture astigmatism astronomical atmosphere bright camera lens collimator collimator lens color errors coma correcting plate curve density depends designed developing agent Diam diameter diffraction disc dispersion distance emulsion Equivalent Focal-length exposure eyepiece Fecker Figure film flexure focal plane focal surface focal-ratio glass grating Grubb Harvard Harvard College Observatory inches instrument length lenses light beam light intensity lines magnitude McMath-Hulbert Observatory measure millimeter mirror motion mounting nebula objective prism Observatory observer obtain optical axis parabolic photoelectric cell photographic plate plate-holder polar axis possible primary prime focus prism radial velocities radius rays reflecting telescope reflector refraction refractor region relative resolving power retina rotation Schmidt camera secondary seconds of arc sensitive simple lens slit solar spectra spectrograph spectroheliograph spectroscope spectrum speed spherical aberration star image starlight stellar thickness transmitted tube-length ultra-violet visual telescope Warner & Swasey wave wave-front wave-length Zeiss