Dial under a seat on the London Underground

Posted Sep 26, 2016, 9:05 PM UTC
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Posted Sep 26, 2016, 9:05 PM UTC
If it's a gauge, it could be a thermometer or pressure gauge for the radiator heating system.
Probably releases the cushion
It was more of a gauge than a dial.
I always thought it was to do with the brakes, these lot agree with me
http://www.pistonheads.com/gassing/topic.asp?t=992899
That makes sense!
solved!
Thanks!
Pretty sure it must be to do with the breaking system as well because the needle mooves when the breaks are breaking