Wow. From the 1970 book "ABC Science Experiments" by Harry Milgrom and Donald Crews. You can pick up a copy used on Amazon or ABE. More scans at Toys and Techniques.
Wow. From the 1970 book "ABC Science Experiments" by Harry Milgrom and Donald Crews. You can pick up a copy used on Amazon or ABE. More scans at Toys and Techniques.