Assertion: galvanometer's magnet | /r/HasProperty | cemented to its back
Facets:
Source sentences:
text: In the heart of that coil, within a little air-chamber, a small round mirror is hung by a single fibre of floss silk, with four tiny magnets cemented to its back.
text: In the heart of that coil, within a little air-chamber, a small round mirror is hung by a single fibre of floss silk, with four tiny magnets cemented to its back.