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Line commutator with 12 plugs (G N T Model 758)

Double tongue commutator used by Wheatstone

1861

Copy of Amperes commutator

1877

Bertin commutator

1886

Smith's mercurial commutator

1902

Ruhmkorff commutator

1872

Ruhmkorff commutator

Double wheel commutator

Clarke's commutator

1836-1851

Thomson commutator motor meter

Ruhmkorff commutator

One circular commutator. has numbers 1 - 10 written on side. Manufacturer unknown

Circular commutator

Hand commutator, (for use with apparatus made by Walter Bailey, to show Arago's motion 1923-318)

Hand commutator

1879
Two Pohl commutators (see 2 stroke nos).

Two Pohl commutators (see 2 stroke nos).

1872
Commutator, Pohl type, by Philip Harris and Co. (1913) Limited

Commutator, Pohl type

1920-1943
Bertin commutator by Townson and Mercer, 34 Camomile Street, London EC.

Bertin commutator by Townson and Mercer

1897-1918