In 1905 Mr. George H. Skinner took out a patent for a carburetter in which both the air and fuel passages varied in accordance with the requirements of the, engine. The original design was a clean and simple layout in marked contrast to the multi-jet fixed choke carburetters and it provided a standard of flexibility and economy of operation hitherto unknown.
Continue at ……. http://sucarb.co.uk/technical-hs-type-carburetter-hs2-hs4-hs6-dismantling
MGB tips mods and maintenance 