Newtonian telescope Newtonian telescope The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton's first reflecting telescope was completed in 1668 and is the earliest known functional reflecting telescope. The Newtonian telescope's simple design makes it very popular with amateur telescope makers. Newton's idea for a reflecting telescope was not new. Galileo Galilei and Giovanni Francesco Sagredo had discussed using a mirror as the image forming objective soon after the invention of the
Hermanos Conde making guitars until his death in 1995, and now his sons and granddaughter maintain the tradition of "Conde Hermanos" at Atocha 53. Famous Flamenco guitarists such as Mario Escudero, Oscar Herrero, Paco de Lucía, Melchor de Marchena, Andrea Nannetti, Niño Ricardo, Rafael Riqueni, Sabicas, Esteban de Sanlucar, Regino Sainz de la Maza and guitarists with other styles such as David Byrne, Leonard Cohen, Jesse Cook, Al Di Meola, Bob Dylan, Toninho Horta, Steve Howe, Lenny Kravitz, Meiko, Cat Stevens or John Williams have played with Hermanos Conde guitars. Hermanos Conde Hermanos Conde (Conde Brothers) are luthiers, makers of classical and