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
Haicke Janssen naval intelligence service N who posed as a cigar salesman. At the court martial in Westminster Guild Hall on 16 July Janssen admitted the espionage charges brought against him. The court martial sentenced him and Willem Roos to death by firing squad. On the early morning of 30 July 1915, Janssen and Roos were executed in the Tower of London by a firing squad of the Scots Guards. Janssen was first at 6 a.m. He rejected his right to be blindfolded. Haicke Janssen Haicke Petrus Marinus Janssen was born in 1885 in Kampen, Netherlands. He was a bookkeeper in Amsterdam