Mueller Bridge

[torch]

Any idea what a Mueller Bridge is?

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A friend sent me the photo. From what I can make out it was made by H. Tinsley & Co. in St. Jerome, Quebec, Canada and might be a "Type 1004". Google tells me the company was/is UK based with no mention of a Canadian subsidiary, but keeps telling me that a Mueller Bridge is a structure in Texas. Or possibly Connecticut. 

[Vgkid]

Mueller bridges were used to measure temperatures(technically resistances) from usually 25ohm rtd's. They are similiar to a wheatstone bridge/kelvin bridge. They use a waidner-woll resistance decade for the adjustable resistance arms, below usually .1ohms.
For more information google mueller bridge nbs.
I can drop some links/documents when I get home in about 3hrs.