22-inch Dobsonian Telescope(Under construction.)

Primary diameter	22in(=558.8mm)
Glass thickness	2in(=50.8mm)
Primary focal length	108.25in(=2750mm)
Suspension	18-point floatation
Primary coatings	Enhanced Al 96%(Spectrum Coatings)
Polished by	Swayze Optical
Primary material	Corning #7740 Pyrex®
Primary weight	54lb(=24.5kg)
Secondary minor-axis dia.	4in(=101.6mm)
Glass thickness	0.75in(=19mm)
Polished by	Discovery
Secondary coatings	Enhanced Al 96%
Secondary weight	1.0lb(=0.47kg)
Secondary material	Corning #7740 Pyrex®
First Light	Nov. 4th 2000

1. Aperture
   I have 10in Newtonian. I want a twice of it. I decided it to 22in.
2. Compactness
   It had to fit comfortably into the HONDA Integra. I use metal componets to compact.
3. Portability
   It had to be light and manageable by one person. The weight of primary mirror is 24.5kg. If I can make use of wood box to carry the primary mirror, the mirror is separable with its cell. I can make use of jack in the car when I can attach the primary mirror to its cell.

• Optics
  First of all, I need an Optics. I have imported an Optics from U.S.A.
• Steel square 14mm by 32mm pipe with thickness 1mm
  It is used for top and bottom ring. These pipes are welded.
• Steel square 32mm by 32mm pipe with thickness 1mm
  It is used for three seesaws of 18-point floatation cell.
• Stell 48.6mm pipe with thickness 2mm
  It is used for middle ring near the trunion and mountings. These pipes are welded.
• Stell 28.3mm pipe with thickness 2mm
  It is used for triangle attached to bottom ring. These pipes are welded.
• Stainless sheet with thickness 2mm and 1mm
  These are used for elliptical mirror cell, spider and support.
• Al. sheet with thickness 5mm
  It is used for compensation plate of 18-point floatation cell, and conbimed to seesaw with screw.
• Turn table
  This is Sugatsune's HF-60. The diameter is 60cm. It is used for horizontal rotation of mountings.
• Barricade
  It is used for fork of mountings.
• Paint