1682 Standard Resistor

The 1682 series of resistors was rated for a maximum power dissipation of 50 watt. They are designed to be filled with oil and there is a stirrer on the panel.

This one is a 0.2 ohm 15 amp version; others were available from about 0.01 ohm to 0.3 ohm.

It is designed for both DC and AC use, although the reactance becomes increasingly significant above 100 Hz or thereabouts.