| 11. | The basic SOON telescope is a evacuated refractor mounted on a polar axis.
|
| 12. | A soft tissue refractor is used to allow for greater visibility and access.
|
| 13. | There's also a desperate need for a Coffee Table Book Lighting Refractor.
|
| 14. | Amateur astronomers use such instruments as the Refractor and the increasingly popular Maksutov telescope.
|
| 15. | An auto-refractor is a computerized instrument that shines light into an eye.
|
| 16. | The binocular auto-refractor measures sphere, cylinder, axis and pupillary distance.
|
| 17. | It is housed in a building about 100 feet northwest of the Clark refractor.
|
| 18. | It was donated to the refractor in 1966.
|
| 19. | It was discovered by Lewis Swift in 1886 with a 16-inch refractor.
|
| 20. | Orion offers a similar refractor model for less than $ 100 on its Web site.
|
