Solar Corona 1875 April 6 (black-and-white transparencies; astrophotographs; Sun; solar eclipses; solar corona; solar prominences; solar chromosphere)
Norman Lockyer’s Seven-Prism Spectroscope and Eyepiece (spectroscope - astronomica; solar eclipse; eyepiece)
Telescope drive clock with electro-mechanical controls and seconds pendulum from Sir Howard Grubb (components; telescope drives (electro-mechanical))
Split-lens eyepiece position micrometer with spherical crystal micrometer and eyepiece dynameter (crystal micrometer; split-lens eyepiece micrometer; dynameter)