History of the telescope a wider field of view than a classic Cassegrain. During the period 1850–1900, reflectors suffered from problems with speculum metal mirrors, and a considerable number of "Great Refractors" were built from 60 cm to 1 metre aperture, culminating in the Yerkes Observatory refractor in 1897; however, starting from the early 1900s a series of ever-larger reflectors with glass mirrors were built, including the Mount Wilson 60-inch (1.5 metre), the 100-inch (2.5 metre) Hooker Telescope (1917) and the 200-inch (5 metre) Hale telescope (1948); essentially all major research telescopes since 1900 have been reflectors. A number of 4-metre class (160 inch)
The Porter Garden Telescope of production (sale price changed from $250 to $400) and the own art nouveau style of the sculpture in full tendency of the art deco style. Years later, in 1936, during the collaboration of Russell W. Porter in the design of the Palomar Observatory and the Hale Telescope, which was the biggest telescope of the world during 45 years, he requested the assignment of using the original patent to J&L.Mac.Co. to be able to implement the horseshoe type mount in that project, obtaining it without obstacles. The Porter Garden Telescope The Porter Garden Telescope, was an innovative ornamental telescope for