1949
 

December, 1949. Lick Observatory, Maksutov Telescopes
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
November, 1949. Star Cameras
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
October, 1949. Measuring and Testing Mirrors
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1949. Johnsonian Telescope
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1949. Observing the Moon, Defraction Gratings, Small Eyepieces, Cassegrainian Mirrors
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1949. Easier Ways to Grind Large Mirrors, Dawes' Limit, Double Star Observing
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1949. Setting Circles, Testing Mirrors with "Oil Flats"
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1949. Porter's Crater. Amateur Telescopes
Cost:$0-100	Difficulty: NA	Danger 0: (NA)	Utility:
April, 1949. Death of Russell Porter
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
March, 1949. A 10" Telescope, Dry-Paper Dry Rouge Polishing, Telescope Mounts on Buildings
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
February, 1949. The Hale Observatory
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
January, 1949. Variable Star Observers. Polar Telescope.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1948
 

December, 1948. Plastic Optics
Cost:$0-100	Difficulty: NA	Danger 0: (NA)	Utility:
November, 1948. Springfield Mountings. Mirror Shadows
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1948. Swiss Amateurs. Barnesite
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
September, 1948. Pros & Cons of Different Focal Lengths, the Schaldach Mount. Cassegrain Telescopes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1948. Making Simple Eyepieces
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1948. An Extraordinary Amateur Scope
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1948. Observatory Domes. Polishing Tips.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1948. Introduction to the Hobby. Euphonium Reflector, Sundials
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1948. Portland Observatory. Mahar-Thomas Tester. Reflector Lenses and Materials.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1948. The Hale Telescope, More on Diamond Abrasives
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
February, 1948. Abrasives, with Focus on Diamond Abrasives
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1948. The Hale Mirror. British Vs. American Eyepieces & Focus Controls
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1947
 

December, 1947. Pocket Telescopes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1947. Erecting Images with Porro Prisms, an Amateur Telescope
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1947. Maksutov Telescopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1947. Terrestrial Telescopes, Image Erection, Objective Lenses
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1947. Operating Draper Machines. Schupmann Telescopes.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1947. More Ways to Work Larger Mirrors. Broadhead's Draper
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1947. Making Thin Mirrors
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
May, 1947. Mirror Thickness
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1947. Cerium Oxide and Other Polishing Agents.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1947. Porter's Grinding Machine. Inexpensive Mirrors.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1947. Mid-Difficulty Telescopes. Domes, Houston Beam-Shifter.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1947. The Pencil Test
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1946
 

December, 1946. Zeiss Mountings
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1946. Rose Tools
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1946. Mirror Cells and Focusers on 12" Telescopes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1946. More on Compound Telescopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1946. Simplifying the Cassegrainian (Dall-Kirkham)
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1946. Weight-Driven Drives. Silvering. Young Telescope Makers
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1946. Profile: Russell Porter. How Polishing Works.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1946. Casting Lenses or Mirror-Grinding Tools in the Kitchen.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1946. Long-Focus Refractors
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1946. Inexpensive Telescope Drive, an Interesting Semi-Portable.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1946. Building Mounts with Junk, Long-Focus Newtonians
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1946. Grinding/Polishing Machine - Continued. More on Pitch Laps.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:

1945
 

December, 1945. Another Grinding/Polishing Machine
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1945. Another Method of Making Mirrors, Conclusion
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1945. Another Method of Making Mirrors
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1945. Newton on "Opticks," Early Reflectors
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
August, 1945. Binoculars, Porro Prisms, Other Materials for Grinding Tools.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1945. Amateur Scopes, Beginner's Woes, Interrupted Grinding
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1945. Permanent Piers, Spider Diffraction
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1945. Making Achromatic Objective Lenses, Concluded
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1945. Making Achromatic Objective Lenses, Continued
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1945. Making Achromatic Objective Lenses
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1945. Air Currents in Reflector Tubes, More on Optical Testing
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1945. Testing Optical Surfaces
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1944
 

December, 1944. More on Maksutov Telescopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1944. Roof Prism Makers
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
October, 1944. The Maksutov Telescope
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1944. Grinding/Polishing Machine, Mirror Testing, Barlow Lenses, Coarse Diffraction Gratings
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1944. All about Binoculars
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1944. Variations on the Gregorian
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1944. A Collapsible Telescope
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1944. A Modified Gregorian for Terrestrial Use, the Death of J. H. Hindle.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1944. Making Optical Flats
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1944. Grating Spectrograph
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1944. Mirror Grinding Problems/Solutions, Tower Domes, 20" Cassegrainian
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1944. Temperature Effects, Clock Drives
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1943
 

December, 1943. Amateur Telescope. Channeling/Cutting Pitch, Gauging Mirror Concavity, Repairing Broken Glass Tools
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1943. Auto-Collimation, the Clark Telescope Makers
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
October, 1943. RFT Telescopes, Why Aluminum Doesn't Make Good Mirrors
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1943. Amateur Telescopes for Education, Setting Circles, Barlow Lenses
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1943. Glass Imperfections, Resin Mirrors? Mirror Tests, Sundry News.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1943. Cassegrain Optical Mathematics
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1943. Collimation of Optical Elements
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1943. Roof Prisms (an Addendum to the Article "a Hobby Goes to War", P. 202f.
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
April, 1943. Amateur Telescopes, Mirror Grinding Tips, Schupmann Telescopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1943. Grinding Machines, Sundials
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1943. Amateur Telescope, Sundials, Eyepieces, Making Abrasives Go Further.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1943. Amateur Telescopes, Housings, Pitch Lap Materials, Prism Tests.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:

1942
 

December, 1942. The 200" Hale Drive, Protecting Optics From Moisture
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1942. An Unusual Turret Telescope, Half Silvering, a Simpler Drive.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1942. Metal Mirrors
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1942. The 200" Hale, Mirror Tolerances, Cassegrains, Domes, Other Pitch Lap Tricks
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1942. More on Spectroscopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1942. Amateur Spectroscopes
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1942. An Improved Alt-Azimuth Mount, Making a Synchronous Motor for Your Drive
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1942. Mexican National Observatory's 24" Schmidt Camera, Perils of Short Focal Length Telescopes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1942. The Macdonald Observatory 82" Mirror, Concluded
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1942. The Macdonald Observatory 82" Mirror
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1942. The 200" Hale Mirror, Concluded
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1942. The 200" Hale Mirror
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1941
 

December, 1941. Grinding Machines, Jobs for Telescope Makers
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1941. Amateur Telescopes, New Printing of Amateur Telescope Making, a New Method of Zonal Testing
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1941. Profile of R. W. Porter, Star Laps, Parabolizing a 12", Controlling Rouge Fineness, Objective Lens Mathematics
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1941. Semi-Portables, an Automated Star Camera, Finding Out-of-Print Astronomy Books
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1941. Telescope Drives. More Mirror Testing Methods.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1941. Amateur Telescopes and General News. 24" Mirrors, Testing Cassegrainian Mirrors
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1941. A German Amateur Telescope, Cutting Pitch, Abrasives, a Clock Drive.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1941. Amateur Telescopes, Quick-Change Eyepieces. Gadget for Mounting a Diagonal.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1941. 20" Mirrors, a Simple Grinding Rig. Diagonal Mirrors
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1941. A Broken Glass Tool, Spectroscopes, a Grinding Machine.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1941. Amateur Telescopes, an Objective Grating, Amateur Astronomy Related Sculpture.
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1941. Schmidt and Wright Cameras
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:

1940
 

December, 1940. Boston Amateur Telescopes, Photos of Palomar Mount. Bubbles in Pyrex, Leonardo Da Vinci's Grinding Machines
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1940. Observatories, Turret Eyepiece Holder, a Penetrometer, Fine Abrasives
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1940. Springfield Mountings. Flat Diagonals Vs. Prisms
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1940. Amateur Telescope, Observatories, the Hartmann Method of Testing. From Amateur to Pro.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1940. Monk Telescope Makers, Sundials
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1940. Refractors, Silvering, Alt-Azimuth Mounts, Other Cooling Media for Grinding
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1940. The Goethe Link Observatory, a New Silvering Technique
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1940. Off-Axis Telescopes, Cassegrainians, a Strobotelescope
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1940. Making Refractors. a Borosilicate Glass Mirror, a Beginner's Sphereometer, about Rouge
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1940. More Amateur Telescopes. Finding Latitudes. the Gaviola Test for Mirrors. (Beg. Corn. "Seeing")
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1940. A Home Observatory, Measuring Lenses, the Palomar Dome.
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1940. Some Amateur Telescopes. Testing Mirrors, Flats, Testing Cassegrain Mirrors. (Beg. Corn. "Semi-Portability") Solar Telescopes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility: