Quote:
Originally Posted by pmrid
A distant memory says the original speculum mirror was the source of many of the scope's later issues. I'd be interested to read any commentary on this.
Peter
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Fred Watson in his book "Stargazer - The Life And Times Of The Telescope"
documents the disappointment with the Great Melbourne Telescope
in Chapter 13 entitled "Heartbreaker".
Amongst the telescope's many shortcomings, Fred details that the
Southern Telescope Committee's decision to stick with the conservative
choice of a metal speculum mirror rather than risk trying the then new
technology of a thin layer of silver on glass "was a fateful decision,
and without doubt was one of the contributors to the telescope's
eventual failure to live up to expectations".
Fred also quotes George Ritchey who noted that the failure of the
telescope ended up setting back the development of large reflector
telescopes universally and that as a result, refractors boldly swung
back into prominence.
Quote:
Originally Posted by George Ritchey, 1904
“I consider the failure of the Melbourne Instrument to have been one of the greatest
calamities in the history of instrumental astronomy; for by destroying confidence in the
usefulness of great reflecting telescopes, it has hindered the development of this type of
instrument, so wonderfully efficient in photographic and spectroscopic work, for nearly a third
of a century”.
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As Fred details, the world had moved on from pencil sketching of nebulae to astrophotography
and even the mirror's staggering 50.6m focal length diluted the faint light too much to make photography
practical.
I recommend Fred's book for additional background.