Large Reflecting Telescopes are Made

first made in the early 1700s. They were short and compact, and were able to put some of the colors into one focal area rather than spread out into the color spectrum.

LARGE REFLECTING TELESCOPES ARE MADE

Telescopes that were large and reflective in nature were not possible until it was discovered how to deposit a layer of silver onto a glass telescope mirror. This was invented around 1856. The advantage was that, if they became dull, a new layer of silver could be deposited on the same mirror. This heralded the modern age of telescopes by the turn of the Twentieth Century. The famous 60-inch Hale telescope was created at a high-altitude location in 1908. Figure 8 shows this Hale telescope dome:

Figure 8.

In 1948, a larger 200-inch Hale reflector telescope was made on Mount Palomar. This was the largest telescope in the world until a Russian telescope was made that was slightly bigger several decades later.