31. The observatory is equipped with reflecting telescopes ranging from four inches to 20 inches in diameter. 32. There he assisted George W . Ritchey who built many of America's first large reflecting telescopes . 33. A small number of reflecting telescopes designs avoid diffraction spikes by placing the secondary mirror off-axis. 34. The observatory's main telescope was a reflecting telescope . 35. A replica of Newton's second reflecting telescope which was presented to the Royal Society in 1672. 36. Douglass made plans to use the Steward gift to construct a 36-inch diameter Newtonian reflecting telescope . 37. In 1979 it was replaced with the Anna L . Nickel telescope, a 1-meter reflecting telescope . 38. The belief that Mars had canals was based on observations Giovanni Schiaparelli made through his reflecting telescope . 39. The observatory also houses and reflecting telescopes . 40. The Palomar Observatory, ( 619 ) 742-2119, with its 200-inch reflecting telescope , is open to the public.
