Telescope drive clock with electro-mechanical controls and seconds pendulum from Sir Howard Grubb, Dublin . Purchased [£25-00] by Sir Norman Lockyer as drive for the 36-inch reflecting telescope [1913-657] at the Solar Physics Observatory, South Kensington. Telescope drive clock with electro-mechanical controls and seconds pendulum from Sir Howard Grubb
One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph, at Wilna Observatory taken during Setember 1870. One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph