Petromax is a brand name for a type of pressurised paraffin lamp (US:kerosene lamp) that uses a mantle.
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Max Graetz (1851–1937) was President of the firm Ehrich & Graetz in Berlin, which developed the lamp, and also the primary designer.
Although this lantern took slightly longer to start, compared with some Petromax types made by Ehrich & Graetz which were equipped with rapid, blowlamp type preheaters, it burned for hours on end without needing attention, providing 300 cp (candle power) light output.