Instruments
The third mirror of the main telescope which sends the light down into the observing room can be moved above three different positions. Two of these have a vacuum spectrograph beneath them, one of 18 meter deep and the other 4 meter deep with lower resolution but higher light throughput. These two spectrographs are able to rotate to compensate for the rotation of the image caused by the use of a heliostat. The third position can only be equipped with a static optical table with no image rotation correction and is therefore rarely used.
The auxiliary telescopes can only be used for imaging on static optical tables and do not provide image rotation correction.
Read more about this topic: Mc Math-Pierce Solar Telescope
Famous quotes containing the word instruments:
“But when to mischiefmortals bend their will,
How soon they find fit instruments of ill!”
—Alexander Pope (1688–1744)
“Sound all the lofty instruments of war,
And by that music let us all embrace,
For, heaven to earth, some of us never shall
A second time do such a courtesy.”
—William Shakespeare (1564–1616)
“Water, earth, air, fire, and the other parts of this structure of mine are no more instruments of your life than instruments of your death. Why do you fear your last day? It contributes no more to your death than each of the others. The last step does not cause the fatigue, but reveals it. All days travel toward death, the last one reaches it.”
—Michel de Montaigne (1533–1592)