The dc generator is probably shunt wound although it may have some compounding. The things with the knobs on are the field rheostats to adjust the voltage. Judging by the similarity of the appearance of the generator and rheostats to BTH equipment I would guess that they were from General Electric, although the styling may have been fairly common.

I expect it will still work if you clean the commutator and free the brushes if stuck.

Thanks for sharing