More observation:
I have a really big magnet from an early 1970s Memorex hard drive from a mainframe computer. The magnet probably weighs 15 pounds. I rubbed the glass tube against the magnet and as expected the pieces in the tube were pulled toward the magnet and interacted with each other. But as soon as I moved the tube away the pieces did not retain any magnetism.
The individual pieces in the tube are black. They are irregular in shape, less than 1/32nd of an inch in length and much smaller in the other two dimensions, and have some flat surfaces. Some have "pointed" ends.
Last edited by Bill Hanlon; 09/16/2026 3:34 AM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| 
