Telescope earliest existing record of a telescope was a 1608 patent submitted to the government in the Netherlands by Middelburg spectacle maker Hans Lippershey for a refracting telescope. The actual inventor is unknown but word of it spread through Europe. [[Galileo Galilei|Galileo]] heard about it and, in 1609, built his own version, and made his telescopic observations of celestial objects. The idea that the [[Objective (optics)|objective]], or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. The potential advantages of using [[parabolic reflector|parabolic mirrors]]—reduction of [[spherical aberration]] and no
Hans Jacob Ulrich Hans Jacob Ulrich Hans Jacob Ulrich (1798 in Zurich – 1877) was a Swiss painter. Ulrich was brought up to be a merchant, but gave up business and devoted himself to painting. He travelled in France, Italy, England, and the Netherlands for improvement, and became a successful painter of landscapes, sea-pieces, birds, and animals. He was a professor at the Zurich Polytechnic. He was an exhibitor at the Salon between 1824 and 1840. Many of his landscapes were English in origin, and he was one of the first of his country to profit by the finer styles of the north