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 in that branch of art. Examples of his work exist in the museums of Orléans and Nantes. C. Huber etched a series of sixty plates from his designs. 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