Tracy Cobb. 9.1.2 Friction in the Altitude Bearings                   9.1.3 Friction in the Azimuth Bearings Chapter 10 The Rocker and Ground Board      10.1 Sizing the Rocker      10.2 Rocker Construction                   10.2.1 Ground Board                   10.2.2 Ground Boards for "The Big Ones"      10.3 Constructing the Ground Board                   10.3.1 The Azimuth Pivot                   10.3.2 How to Make the Pivot Bolt                   10.3.3 Installing the Pivot Bolt                   10.3.4 Installing Teflon Bearing Pads                   10.3.4.1 Calculating the Size of the Altitude Bearing Pads                   10.3.4.2 Calculating the Size of the Azimuth Bearing Pads      10.4 A Handy Option: Bearing Locks      10.5 Handles for Portability                   10.5.1 "It Rolls On Air"                   10.5.2 Attaching Handles to the Rocker      10.6 Handling the Big Ones Chapter 11 Assembly and Troubleshooting      11.1 Last-Minute Preparations      11.2 Installing the Optics                   11.2.1 Center-Dot the Primary                   11.2.2 Center Dot the Secondary Mirror                   11.2.3 Install the Primary Mirror                   11.2.4 Install the Secondary Mirror                   11.2.5 Adjust the Sling                   11.2.6 Collimate the Optics      11.3 Set-Up, Use, and Take-Down                   11.3.1 Set Up                   11.3.2 Using the Telescope                                     11.3.2.1 Balance                                     11.3.2.2 Bearing Surfaces                                     11.3.2.3 Dew                                     11.3.2.4 Ventilation                                     11.3.2.5 Safety Precautions                   11.3.3 Take-Down      11.4 Cleaning the Optics      11.5 Troubleshooting                   11.5.1 Too Little Focus In-Travel                   11.5.2 Sticking Poles and Blocks                   11.5.3 Telescopes and Moisture Chapter 12 Using Big Dobsonians      12.1 Eyepieces      12.2 Filters      12.3 Finders                   12.3.1 The Telrad® Finder                   12.3.2 Finder Telescopes                   12.3.3 Get Two Finders                   12.3.4 Jumbo Finders                   12.3.5 Digital Setting Circles      12.4 Electrical Accessories                   12.4.1 Dew Zappers                   12.4.2 Heat Ropes                   12.4.3 Portable 12-Volt Power                   12.4.4 Marine Batteries                   12.4.5 Power on the Secondary Cage      12.5 Keeping Warm and Dry                   12.5.1 Warm Clothing                   12.5.2 Keep Warm with Heat Packs      12.6 Eliminating Stray Light                   12.6.1 The Light Shroud                                     12.6.1.1 Sewing a Shroud                                     12.6.1.2 Installing the Shroud                   12.6.2 Focuser Baffling                   12.6.3 The External Light Baffle                   12.6.4 The Tailgate Cover      12.7 Telescope Covers                   12.7.1 Mirror Box Dust Cover                   12.7.2 Hat Box for the Secondary Cage                   12.7.3 Secondary Mirror Cover                   12.7.4 The Telescope Cover      12.8 Dark Observing Sites                   12.8.1 Why You Need a Dark Site                   12.8.2 Site Selection                   12.8.3 Human Factors Chapter 13 Epilog: Making a Small Telescope      13.1 Materials You Need      13.2 Overview of Construction      13.3 Begin with the Tube                   13.3.1 The Primary Mirror Cell                   13.3.2 Locate the Mirror Cell                   13.3.3 Finish the Tube                   13.3.4 Add End Rings                   13.3.5 Assemble the Tube      13.4 The Mounting                   13.4.1 Build the Tube Cradle                   13.4.2 Side Bearings                   13.4.3 Locate the Tube Balance Point                   13.4.4 Construct the Rocker                   13.4.5 Make the Ground Board Appendix A Wood as a Structural Material      A.1 The Properties of Plywood                   A.1.1 Types of Plywood                   A.1.2 The Stiffness of Plywood      A.2 Selecting Plywood for Telescopes                   A.2.1 Hardwood Veneer Hardwood Core Plywoods (HVHC)                   A.2.2 Hardwood Veneer Softwood Core Plywoods (HVSC)                   A.2.3 Softwood Veneer Softwood Core Plywoods (SVSC)    A.2.4 Particle Board Appendix B Grinding, Polishing, and Figuring Large, Thin Mirrors      B.1 Obtaining a Mirror Blank                   B.1.1 Porthole Glass: the Classic Choice                   B.1.2 Pyrex Sheet Glass                   B.1.3 Choose the Mirror Diameter                   B.1.4 Choose the Mirror Thickness                   B.1.5 Choose the Focal Ratio      B.2 Grinding Tools                   B.2.1 Solid and Built-up Tools                   B.2.2 Segmented Tools      B.3 Prepare a Suitable Work Area      B.4 Preparing for Grinding                   B.4.1 Facing the Blank                   B.4.2 How to Prevent Astigmatism                   B.4.3 Bevel the Edge                   B.4.4 Grinding Strokes      B.5 Rough Grinding      B.6 Fine Grinding                   B.6.1 Fine Abrasives                   B.6.2 Getting a Sphere                   B.6.3 Going on to #220                   B.6.4 The Fine Side of Fine Grinding      B.7 Preparing to Polish                   B.7.1 Pitch                   B.7.2 Polishing Agents                   B.7.3 Pitch Base      B.8 Making the Pitch Lap                   B.8.1 Grooving the Lap                   B.8.2 Pressing the Lap      B.9 Polishing                   B.9.1 Judging the "Feel" of the Lap                   B.9.2 Holding the Lap                   B.9.3 Completing the Polish      B.10 Testing                   B.10.1 Test Stand and Testing Tunnel                   B.10.2 Begin Testing Early                   B.10.3 Testing for Astigmatism      B.11 Figuring                   B.11.1 Goals in Figuring                   B.11.2 Rating Telescope Mirrors                   B.11.3 Do the Best You Can      B.12 Test Methods                   B.12.1 Testing the Sphere                            B.12.2 The Sphere and the Paraboloid                            B.12.3 Star Testing                                   B.12.3.1 Doing a Star Test                                   B.12.3.2 Interpreting the Star Test                           B.14.4 Applying a Null Test                          B.14.5 Reading a Ronchi Screen       B.13 The Art of Figuring 24                   B.13.1 High, Low, Long, Short                   B.13.2 Figuring Laps                   B.13.3 Figuring Strokes                                   B.13.3.1 The Long, Straight, Central Stroke                                   B.13.3.2 The W Stroke                                  B.13.3.3 Tangential Strokes                                   B.13.3.4 Strokes for Small Polishers                   B.13.4 Correcting a Low Edge                   B.13.5 Correcting a Turned-Down Edge                   B.13.6 Correcting High Zones                   B.13.7 Correcting Low Zones      B.16 A Few Final Words Appendix C Digital Setting Circles      C.1 A Bit of History      C.2 How Digital Circles Work      C.3 Accurate Circles Need an Accurate Telescope      C.4 Installation                   C.4.1 Mounting the Azimuth Encoder                   C.4.2 Mounting the Altitude Encoder                   C.4.3 Mounting the Computer      C.5 General Advice Appendix D Equatorial Platforms Appendix E Resources and Suppliers      E.1 Aluminum tubing      E.2 Foam tube insulation      E.3 Double-sided tape      E.4 Specialty tools, knobs and latches      E.5 Threaded inserts      E.6 Levelers (collimation knobs)      E.7 Felt tabs and floor protector pads (mirror cell pads)      E.8 HVHC plywood (Hardwood Veneer Hardwood Core)      E.9 Sliders or cord locks and sling webbing      E.10 Heat ropes      E.11 Heat paks      E.12 Black Ripstop Nylon (for the light shroud)      E.13 Kydex plastic for the light baffle      E.14 E.14 Etched virgin Teflon      E.15 #1782 Stardust Quarry Finish Formica      E.16 #4552-50 Ebony Star countertop laminate      E.17 Glassboard (bead board or fiberglass reinforced panel)      E.18 Self-tapping threaded wood inserts      E.19 Cam levers      E.20 12-Volt cooling fans      E.21 Ladders (for big telescopes)      E.22 Small parts      E.23 Epoxy resins      E.24 Loading ramps, pneumatic wheels for wheelbarrow handles, and marine trailer jacks      E.25 Black aperture f/ratio labels      E.26 Plastic grommets for light shroud      E.27 Duct tape      E.28 Collimation tools      E.29 Commercial Components for Telescope Making                   E.29.1 Optics, focusers, digital setting circles, eyepieces, Telrads                   E.29.2 Spiders and secondary mirror holders                   E.29.3 Cast aluminum poles seat, clamping wedges, side bearings      E.51 Mirror Making Supplies                   E.51.1 Pyrex glass                   E.51.2 Kerr dental plaster                   E.51.3 MicroGrit abrasives                   E.51.4 Optical pitch                   E.51.5 Ronchi screens for mirror testing Bibliography Afterword Index. Building your own scope presents the opportunity to continually upgrade and customize over time. With its whimsical style and thorough treatment of the subject the book is destine to become a classic along with Albert Ingalls's Amateur Telescope Making and Jean Texereau's How to Make a Telescope.” (Sky & Telescope magazine), Chapter 1 Large Aperture Dobsonians    1.1 Why Dobsonians Are Newtonians    1.2 How Dobsonians Work    1.3 The History of the Dobsonian Telescope          1.3.1 John Dobson Invents the Dobsonian          1.3.2 The Dobsonian Revolution          1.3.4 The Second Dobsonian Revolution 1.4 The Dobsonian in Your Future Chapter 2 Planning Your Telescope      2.1 Non-Telescopic Telescope Considerations      2.2 Tough Telescopic Considerations          2.2.1 Telescope Aperture Considerations          2.2.2 Are You Obsessed?

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