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Several names for it. Constant voltage transformer. Ferro-resonant transformer. Voltage regulating transformer. ALL mean the same thing. A transformer which uses forced core saturation to hold the output voltage steady..regardless of load or line changes(within reason of course). That oil cap is across the main secondary winding and tunes the winding in some way--without it--it will NOT regulate right and ALL voltages out of it will be quite low.
I would say the primary winding will be around 2-4 ohms--likely no lower or higher. The main secondary will be somewhat higher--and any LV secondaries will be a LOT lower likely.
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