1. Millenium Telescope. Initial Meeting.

2. Format Part 1 - Planning Part 2 - Sample Designs Part 3 - Discussion/what happens next

3. Objectives 4 Resolve location and usage issues 4 Agree design 4 Present detailed design/cost to Committee 4 Go/No Go?

4. Aperture Fever…!

5. Part 1 - Planning...

6. Location/usage Most difficult part! Dedicated effort Some options 5 Dome ? Balcony ? Downstairs ? Elsewhere in school grounds

7. Design Goals 4 Ease of construction 4 Ease of assembly/disassembly 4 Ease of storage and transportation 4 Ease of collimation (repeatable)

8. Mirrors Primary Mirror (Pyrex): –Diameter, 482 mm –Edge thickness, 38 mm –Focal length, 2165 mm (F/4.5) –Calculated weight 15 Kg Secondary Mirror (elliptical plate glass): –Major axis, 150 mm –Minor axis, 106 mm –Thickness, 14.5 mm

9. Part 2 - Sample Designs

10. Kriege and Berry Obsession 20” F/5

11. Obsession 20” F/5 Completed scope

12. Obsession 20” F/5 Unpacking truss tubes

13. Obsession 20” F/5 Opening mirror box

14. Obsession 20” F/5 Inserting mirror

15. Obsession 20” F/5 Setting mirror down

16. Obsession 20” F/5 Install upper tube clamps

17. Obsession 20” F/5 Mirror cell assembly

18. Obsession 20” F/5 Truss tube clamps

19. Obsession 20” F/5 Securing mirror

20. Dan Gray 16” F/3.75 String Telescope

21. 16” F/3.75 String Telescope Completed scope

22. 16” F/3.75 String Telescope Base

23. 16” F/3.75 String Telescope Close-up of bearings

24. 16” F/3.75 String Telescope Rocker

25. 16” F/3.75 String Telescope Square tube support

26. 16” F/3.75 String Telescope String length adjustment

27. 16” F/3.75 String Telescope Collimation adjustment point

28. 16” F/3.75 String Telescope Secondary cage and spider

29. 16” F/3.75 String Telescope Collimating

30. 16” F/3.75 String Telescope Disassembled scope

31. 16” F/3.75 String Telescope In car!

32. Greg Babcock 18” F/4.55

33. 18” F4.55 Completed scope

34. 18” F4.55 Gallery

35. Greg Babcock 24” F/4 Ultra-light

36. 24” F/4 Ultra-Light Completed and disassembled scope

37. 24” F/4 Ultra-Light Altitude bearing and stand

38. 24” F/4 Ultra-Light 4” Mirror cell clearance for drive

39. 24” F/4 Ultra-Light Trusses

40. 24” F/4 Ultra-Light Cage

41. 24” F/4 Ultra-Light Completed scope

43. 24” F/4 Ultra-Light In car!

44. Bruce Sayre 22” F4.05 Design

45. 22” F4.05 Design Completed scope

46. 22” F4.05 Design Base

47. 22” F4.05 Design Cutaway of bottom frame and drives

48. 22” F4.05 Design Close-up of bottom frame

49. 22” F4.05 Design Bottom portion of telescope

50. 22” F4.05 Design Side view of rocker

51. 22” F4.05 Design Rocker

52. 22” F4.05 Design Mirror cell multipoint flotation assembly

53. 22” F4.05 Design Mirror cell with flotation assembly underneath

54. 22” F4.05 Design Drive motor assembly

55. 22” F4.05 Design Strut attachment

56. 22” F4.05 Design Truss tube mounting

57. 22” F4.05 Design View above completed scope

58. 22” F4.05 Design Secondary cage and spider assembly with baffling

59. 22” F4.05 Design Secondary cage side view

60. Digital Astrophotography C2020z - Planets with 20” Newtonian

61. Part 3 - Discussion 4 Team for location/storage 4 Obtain 45 gal drum 4 Consolidate designs/plans –Contact designers (email) –Monitor bigdob discussion group 4 Contact FAS/other AS for feedback 4 Possible visit(s) to other AS 4 Agree next meeting