One of the mysteries of the English language finally explained.
A portable oil or paraffin lamp in which the fuel is forced up into the mantle or burner by air pressure in the reservoir, which can be increased by pumping with a plunger.
- ‘The PT Ultra Prima Cemerlang factory uses thorium nitrate in its production of socks for pressure lamps (petromax).’
- ‘The day length was 14 h and additional illumination was provided by sodium high pressure lamps.’
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