Possibly because it has no metalic or ferrite core, how much do they weigh?Thanks, guys. It reads dead short on ohm meter, and touching an AA battery to the terminals made spark, but NO magnetic reaction.
BTW, are they in a 'Potted' container?Found a few of these in a cigar box marked "coils" at an estate sale. 2" diameter by 1 1/2" tall. Marked "Ferrodyne Corporation" and "FSI-6". ONLY internet reference about company is that it folded in 1993.
A small battery might not be enough?.Not an electromagnet. Hole through center is only about 1/8", and it's not even counter-sunk. I touched a battery to it and there was no magnetism, just sparking.
If they read 0 ohms or close, they may not be magnets, if they were I would expect at least 5 Ohms. Minimum.Thanks, guys. It reads dead short on ohm meter, and touching an AA battery to the terminals made spark, but NO magnetic reaction.
Just as 'similar' (but smaller) examples: