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You can find a fantastic old film showing actual high speed camera footage of the "pressure stream" system in action here:
Go directly to the 7:57 mark to see the main action.
This film is from 1937. From 1940 up (I think) the oil pump capacity was increased and at some point the nozzle diameters were slightly reduced (as per my post above) so the advancing stream of oil in Kevin's 1947 would actually reach much further out by the time the dipper comes around and hits it. The distance the stream reaches out between scoops should remain about the same regardless of RPM's because the volume changes in direct proportion to the RPM as no oil is being bypassed unless the pressure is above the 60 or more psi setting of the bypass in the pump itself. (which rarely happens, and never with hot oil)