Look at my compressor

[Charles in Aus.]

Must have been running alcohol gas it's all gummed up . Better use that straight gas for this. So now is a vane the same thing as the screw compressors being raved about now days. Or are they more like a vane hydraulic pump?

The answer might be in the name ' Hydrovane ' . The same company made pto driven air compressors for Ferguson TE20 tractors in the 1950s.

 

[kencombs]

My memory is not good, but I seem to remember putting a 4 cell-8 volt wet battery on an old 6 volt farm tractor, without changing anything other the battery.

Yep, those things were common in the 50-60s as a bandaid for slow starting cars/trucks/tractors. To get the best results the voltage regulator had to be adjusted to about 9-9.5v to keep them fully charged.