The principle is similar to that of the moving-magnet except that a stationary magnet induces a field into an armature which is moved by the cantilever. It was a useful alternative when a magnet could add appreciable mass to the cantilever. Lightweight magnetic materials have now overcome this snag, so the induced magnet is less attractive.
"I found a 78 record in a box of old stuff that said it was recorded in 1950 and was a recording my my sister when she was 4 years old singing Jingle Bells to Santa. I had no idea if the record was any good, but I took a chance and sent it in to have it transferred to a CD. I am so thrilled with the result! It was worth every penny. The CD is ..."