K/PP107/11/1/1
Dated 1837-1840. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].
Electromagnetic telegraph receiver bell mechanism, brass on a wooden base, case missing [see diagram K/PP107/1/4/44].
Dated 1837-1840. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].
Electromagnetic telegraph receiver bell mechanism, brass on a wooden base, case missing [see diagram K/PP107/1/4/44].