1979
 

December, 1979. The Physics and Chemistry of a Failed Sauce B*arnaise
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1979. Flames in Which Air Is Introduced into a Flammable Gas Rather Than Vice Versa
Cost:$0-100	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility:
October, 1979. The Mysterious "Rattleback": a Stone That Spins in One Direction and Then Reverses
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
September, 1979. A Radiation Detector Made Out of Aluminum Foil and a Tin Can
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1979. Delights of Forming Water into Sheets and Bells with Knives, Spoons and Other Objects
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1979. How to Build a Simple Seismograph to Record Earthquake Waves At Home
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1979. Experiments with Edwin Land's Method of Getting Color Out of Black and White
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1979. How to Measure the Size of the Earth with Only a Foot Rule or a Stopwatch
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1979. More on Boomerangs, Including Their Connection Whit the Dimpled Golf Ball
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1979. Boomerangs! How to Make Them and Also How They Fly
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1979. Strange to Relate, Smokestacks and Pencil Points Break in the Same Way
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1979. How to Make Dazzling Photomicrographs with Simple and Inexpensive Equipment
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1978
 

December, 1978. Moire Effects, the Kaleidoscope and Other Victorian Diversions
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1978. Serious Fun with Polyox, Silly Putty, Slime and Other Non-Newtonian Fluids
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1978. Some Whispering Galleries Are Simply Sound Reflectors, But Others Are More Mysterious
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1978. The Bring Colors in a Soap Film Are a Lesson in Wave Interference
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1978. Observations on Grinding Glass By Hand and on Making the Most of a Fireplace
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1978. Chemical Systems That Oscillate Between One Color and Another
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
June, 1978. Drops of Liquid Can Be Made to Float on the Liquid. What Enables Them to Do So?
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1978. What Plumes of Smoke Tell about the Structure of the Atmosphere
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1978. The Physics and Chemistry Underlying the Infinite Charm of a Candle Flame
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1978. Visual Illusions That Can Be Achieved By Putting a Dark Filter Over One Eye
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
February, 1978. Introducing the Musha, the Double Lozenge and a Number of Other Kits to Build and Fly
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1978. More about Polarizers and How to Use Them, Particularly for Studying Polarized Sky Light
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:

1977
 

December, 1977. Studying Polarized Light with Quarter-Wave and Half-Wave Plates of One's Own Making
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
November, 1977. Wonders of Physics That Can Be Found in a Cup of Coffee or Tea
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
October, 1977. The Salt Fountain and Other Curiosities Based on the Different Density of Fluids
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1977. Hot Water Freezes Faster Than Cold Water. Why Does It Do So?
Cost:NA	Difficulty: NA	Danger 0: (NA)	Utility:
August, 1977. Drops of Water Dance on a Hot Skillet and the Experimenter Walks on Hot Coals
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
July, 1977. How to Create and Observe a Dozen Rainbows in a Single Drop of Water
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1976
 

February, 1976. Thin-Layer Chromatography: a Convenient Way of Separating Things That Are Very Much Alike
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1976. How an Amateur Can Construct a Model of an Enzyme Molecule At Modest Cost
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1975
 

December, 1975. Diverse Topics, Starting with How to Supply Electric Power to Something That Is Turning
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
November, 1975. How to Build and Work with a Skinner Box for the Training of Small Animals
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
October, 1975. An Amateur's Version of a. a. Michelson's Apparatus for Measuring the Speed of Light
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
September, 1975. Electronic Stratagems Are the Key to Making a Sensitive Seismometer
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
August, 1975. Graphs That Predict When Planets Will Line Up with Another Planet or the Sun
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1975. Among Other Things, a Greenhouse Shade That Re-Creates the Lighting of the Tropics
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1975. Diverse Topics, From Enhanced Astronomical Photograph to an Ingenious Electric Motor
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1975. Making a Refractometer for the Identification of Liquids
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
April, 1975. An Amateur Undertakes the Ultimate in Mechanical Precision, a Ruling Engine
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1975. The Ultimate in Sailing Is a Rig Without a Hull
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1975. The Pleasures and Problems of Raising Snails in the Home; Snail Anatomy
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1975. A High School Student Builds a Recording Spectrophotometer
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:

1974
 

December, 1974. Hang Gliding, or Sky Surfing, with a High-Performance, Low-Speed Wing
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
November, 1974. Of Cross-Staffs, Paraboloids, Sun Viewers and Other Useful Tools and Experiments
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
October, 1974. Electrostatic Motors Are Powered By Electric Field of the Earth
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1974. A Venerable Clock Is Made Highly Accurate By Equipping It with Quarts-Crystal Works
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1974. An Air Flash Lamp Advances Color Schlieren Photography
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
July, 1974. The Polariscope As a Measuring Instrument and As a Means of Creating Objects of Art
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1974. An Unusual Kind of Gas Laser That Puts Out Pulses in the Ultraviolet
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
May, 1974. A Plotting Device for Predicting the Orbit of an Earth Satellite
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1974. Curious Bubbles in Which a Gas Encloses a Liquid Instead of the Other Way Around
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1974. A New Kind of Spectrohelioscope for Observing Solar Prominences
Cost:$100+	Difficulty:	Danger 2: (Minor injury possible)	Utility:
February, 1974. The Voiceprints of Birdsongs and Cockroaches in a Maze
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1974. Weather-Satellite Pictures Are Picked Up in the Home
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:

1973
 

December, 1973. A Cold Camera for Astronomical Photography and Cardboard Segments for Big Paraboloids
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
November, 1973. A Sensitive Tiltmeter That Serves As a Seismometer
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
October, 1973. Moir* Patterns Draw Contours, and a Meter Determines Current in Electrostatic Circuits
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1973. A High School Physics Club Builds Electron Microscopes
Cost:$100+	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility:
August, 1973. Water Droplets That Float on Water, and Lissajous Figures Made with a Pendulum
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
July, 1973. How to Blow Bubbles That Survive for Years
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
June, 1973. A Laser Beam and a Photocell Are Used to Measure the Dirt Content of Water
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
May, 1973. Microelectronic Flip-Flops and NAND Gates Add Up to a High-Speed Counter
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
April, 1973. Machines That Work Like Muscles, and How Maxwell's Demon Was Captured in a Bottle
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
March, 1973. Infrared for the Amateur: Infrared Diode Lasers and an Infrared Filter
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
February, 1973. Molecular Models and an Interferometer That Can Be Constructed At Modest Cost
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
January, 1973. An Inexpensively Modified Transistor Radio Is Used in Several Entertaining Experiments
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1972
 

December, 1972. The Joys of Culturing Spiders and Investigating Their Webs
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
November, 1972. Sound Waves and Radio Waves Are Recorded on Film By Means of a Precooling Process
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
October, 1972. An Observatory Built in a Pond Provides a Good View of Aquatic Animals and Plants
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
September, 1972. Mead, the Drink of the Vikings, Can Be Made (Legally) By Fermenting Honey in the Home
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
August, 1972. A Compact Short-Focus Telescope with Spherical Optical Surfaces
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
July, 1972. An Amateur Makes a Wind Tunnel to Study the Vortexes That Form Around a Cylinder
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
June, 1972. Outdoor Temperature, Humidity, Wind Speed and Wind Direction Are Displayed on a Panel
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
May, 1972. Advice Is Offered on Equipment and Safety Procedures for a Forthcoming Solar Eclipse
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
April, 1972. What Happens to the Fluid in the Tanks of a Spacecraft Falling Freely in Space?
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
March, 1972. A Simple Motor with Compensating Devices Is the Key to a Homemade Chart Recorder
Cost:$100+	Difficulty:	Danger 1: (No hazards)	Utility:
February, 1972. A Simple Laser Interferometer, an Inexpensive Infrared Viewer and Simulated Chromatograms
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
January, 1972. Groups Are Organized to Observe the Eclipse of Stars By the Moon
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1971
 

December, 1971. An Amateur Breaks Glass with a Purpose: to Determine the Patterns of Fracture
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
November, 1971. An Osmotic Pump, an Unusual Timer and How to Enhance Contrast in Astronomical Photographs
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
October, 1971. Experiments with Wind: a Pendulum Anemometer and Miniature Tornadoes
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:
September, 1971. A Carbon Dioxide Laser Is Constructed By a High School Student in California
Cost:$100+	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility:
August, 1971. How to Build a Machine to Produce Low-Energy Protons and Deuterons
Cost:$0-100	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility:
July, 1971. How to Ensure a Good Hologram and How to Build an Unusual Kind of Barometer
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
June, 1971. Experiments with Salt Fountains and Related Instabilities in Water
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
May, 1971. Schlieren Photography Is Used to Study the Flow of Air Around Small Objects
Cost:$100+	Difficulty:	Danger 2: (Minor injury possible)	Utility:
April, 1971. Some Delightful Engines Driven By the Heating of Rubber Bands
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
March, 1971. Generating Visual Illusions with Two Kinds of Apparatus
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
February, 1971. Experiments with a New Standard Filter Material That Has Extremely Fine Pores
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
January, 1971. On the Differential Operational Amplifier, a Device That Simulates Almost Anything
Cost:$0-100	Difficulty:	Danger 1: (No hazards)	Utility:

1970
 

December, 1970. How to Make an Isoteniscope: an Apparatus for Measuring the Boiling Point of Fluids
Cost:$100+	Difficulty:	Danger 2: (Minor injury possible)	Utility:
November, 1970. A Modulator Is Constructed for Laser Light, and Phase-Contrast Microscopy Is Simulated
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
October, 1970. The Color Vision of Pigeons Is Tested in a Skinner Box
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
September, 1970. Curious Oscillators That Involve Salt Water, Flame and Hot Wire
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
August, 1970. Devices for Listening to Sounds Both in Water and in the Solid Earth
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
July, 1970. How to Construct a Molecular-Beam Apparatus and a Mass Spectrometer
Cost:$100+	Difficulty:	Danger 3: (Serious injury possible)	Utility:
June, 1970. The Effects of Gravity on Plant Growth, and the Deposition and Use of Thin Films
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
May, 1970. A Simple New Amplifying Device Is Adapted to Driving a Pen Recorder
Cost:$0-100	Difficulty:	Danger 2: (Minor injury possible)	Utility:
April, 1970. An Ambitious Observatory Is Built By Father and Son
Cost:$100+	Difficulty:	Danger 2: (Minor injury possible)	Utility:
March, 1970. How to Study the Life of a Pond and to Cultivate Aquatic Insects
Cost:$0-100	Difficulty:	Danger 3: (Serious injury possible)	Utility:
February, 1970. A Tunable Laser Using Organic Dye Is Made At Home for Less Than $75
Cost:$100+	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility:
January, 1970. Experiments in Generating the Constituents of Living Matter From Inorganic Substances
Cost:$100+	Difficulty:	Danger 4: (POSSIBLY LETHAL!!)	Utility: