On Jan 19, 12:19*am, "T.T." wrote:
"Paul Schlyter" wrote in message

...







In article 79512be1-cb35-4a31-832a-d4940ff357e9
@sb6g2000pbb.googlegroups.com, says...

In looking again at the February 2013 Sky and Telescope, on page 9,
Lawrence H. Aller is quoted as noting that many optical astronomers
were, in 1963, struggling with equipment that was a hundred years old.
(But ample funding was available for novel fields, such as radio
astronomy and space satellites.)

This somewhat puts in perspective the funding issues faced by the
astronomical community today.

John Savard

I'm currently reading the book "Giant Telescopes" by W Patrick McCray,
which describes optical astronomy from the 5-meter (200-inch) Palomar
telescope to today's giant telescopes.

The 5-meter Palomar telescope remained the world's largest optical
telescope for 28 years, from 1948 until the russian 6-meter telescope was
finished in 1976. Then it took another 17 years until the 10-meter Keck I
telescope was finished in 1993. *During those years there were nine
telescopes 3 meters or larger built though.

Also, during these years, there were strong improvements in the detectors
used in the large telescopes, from traditional photographic plates to
photomultiplier tubes to today's modern CCD imaging devices. *A 1-meter
telescope using a modern detector can easily outperform the 5-meter
Palomar telescope using traditional photographic plates.

I don't remember the year, but it was before the Palomar telescope began
operation,
an astronomer friend of the family wangled us a guided tour of the the dome.
It was awe-inspiring stuff, and the thing that impressed me the most was a
sort of clock-work drive that aimed the monster.
It was no bigger than a small refrigerator with gears and cogs no more
robust than a grandfather clock's.

Massive telescopes now and to come, incredible detectors, image
stabilization. Professional telescopes seem to have weathered bad
economics well enough, which is good.