In the days before battery powered torches many used a slush lamp to provide the light they needed to carry out their duties. It held a flammable liquid like paraffin. When the wick was lit the slush lamp provided sufficient light.Slush lamps were designed to be carried around but they could be dangerous because they have flame as a source of light. This is an example of a portable lighting device in common usage before the use of batteries.A black metal slush lamp with two glass panels and a stock. At the back is a hinged door. There is a hole on top caused by rust or being burned through. Kerosene or oil was probably the fuel used.On top of light - Serial No 339220slush-lamp lighting kerosene oil