Assertion: bobbin's form | /r/HasProperty | consisted of a coil wound
Facets:
value: on a short hollow cylindrical form
type: OTHER
value: with a second smaller coil
type: OTHER
Source sentences:
text: One common form consisted of a coil wound on a short hollow cylindrical form, with a second smaller coil inside, mounted on a shaft so its magnetic axis can be rotated with respect to the outer coil.