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P.O. polarised relay

Creed polarised relay, 7129 2

Telegraph instrument

Polarised relay 3000 type for exchange ringing on two button D.C. omnibus circuits

Polarised relay, Siemens Bros. & Co. Ltd., No. 14625

Siemens' polarised relay, 1869

1869

Polarised relay 5000/5000 used on railway selective circuits

Polarised relay used on 2-button D.C. omnibus circuit

Two polarized relays, marked 'Telegraph Works, Silvertown'

Two polarized relays

Two polarised relays used on D.C. selective ringing telephone omnibus circuit, Newport station exchange

Two polarised relays used on D.C. selective ringing telephone omnibus circuit

Two polarised relays 4500/4500 used on 4-button selective omnibus circuits, Newport station exchange

Two polarised relays 4500/4500 used on 4-button selective omnibus circuits

Two polarised relays 10000/10000: (a) used on railway control telephone system; (b) used on railway selective circuits - from Newport station exchange

Two polarised relays 10000/10000

Two polarised relays, early Creed type

Two polarised relays, early Creed type

Two polarized relays, unknown manufacture

Two polarized relays, unknown manufacture