Abstract
Equatorial mounts have a “difficult spot” near the pole; altazimuths have it near the zenith. This ball-mounted reflector avoids both problems. Perhaps the best-known example of this type of mounting is the Edmunds Astroscan. Steven Lee has successfully extended this principle to a 12.5 in (315 mm) telescope, showing, on the way, how a typical ATM overcomes the problems that beset him.
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© 1999 Springer-Verlag London
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Lee, S. (1999). A Ball-Scope: The Best Portable Telescope!. In: Tonkin, S.F. (eds) Amateur Telescope Making. Practical Astronomy. Springer, London. https://doi.org/10.1007/978-1-4471-0567-1_8
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DOI: https://doi.org/10.1007/978-1-4471-0567-1_8
Publisher Name: Springer, London
Print ISBN: 978-1-85233-000-2
Online ISBN: 978-1-4471-0567-1
eBook Packages: Springer Book Archive