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Collection
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Place
Date

Bertin commutator

1886

Double tongue commutator used by Wheatstone

1861

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

Copy of Amperes commutator

1877

Smith's mercurial commutator

1902

Double wheel commutator

Thomson commutator motor meter

Clarke's commutator

1836-1851

Ruhmkorff commutator

Ruhmkorff commutator

Ruhmkorff commutator

1872
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
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
Two Pohl commutators (see 2 stroke nos).

Two Pohl commutators (see 2 stroke nos).

1872