Joseph Wilson Swan and Sir James Dewar [full inscription unknown]

This plaque is mentioned in http://www.walklondon.org.uk/uploads/File/leaflets/lvws2directions_15062010214941.pdf

East Duck Lees Lane, Enfield, London
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Colour: blue

Wikimedia:

Flickr:

See also...
Photo of Joseph Swan blue plaque
Spudgun67 on Wikimedia Commons
Photo of Joseph Swan and Underhill blue plaque
HJGrey on Flickr
Photo of Joseph Swan stone plaque
newcastleplaques on Flickr
Photo of Joseph Swan black plaque
newcastleplaques on Flickr